Feron bakkeri (agamic)

Heteroecus devorus (sexgen)

Heteroecus crescentus (sexgen)

Neuroterus chrysolepis (agamic)

Andricus reticulatus (sexgen)

Callirhytis lentiformis (agamic)

Andricus bakkeri

Gall:
A monothalamous, cup-shaped leaf spangle, 3-3.5 mm in height. The larval cell occupies the base of the cup whose margins are collapsed at maturity. The galls appear on the leaves during the early summer months and grow rapidly until they reach full size in August. At this time the galls are red and contain small larvae. Pupation occurs in late October and early November.

Hosts:
Quercus dumosa 
Quercus engelmanni
Quercus garryana

Range: La Crescenta CA

Heteroecus devorus, New Species
Bisexual generation

Hosts: Quercus chrysolepis

Gall (Fig. 1E).—A small, monothalamous leaf blister 2.3 mm in length. The galls are visible on both surfaces of the new leaves and mature rapidly. Adults emerge from the upper surface of the gall 24 May-7 June. 

Range: Pasadena CA

Heteroecus crescentus, new species
bisexual generation

Hosts: Quercus chrysolepis

Gall (Fig. 1D).—A small, green blister two and one-half mm in length, showing on both sides of the leaf. Galls are double chambered with the developing larvae and pupae occupying the lower chamber. The adult insects emerge from the lower side of the leaf. 

Locality.— The type and paratypes were collected from galls on Quercus chrysolepis Liebm. in La Crescenta, California. 

Neuroterus chrysolepis, new species

Host. — Quercus chrysolepis Liebm. 

Gall (Fig. 1A).—An abrupt, blister-like, monothalamous swelling that arises on the young stems of Quercus chrysolepis. The galls mature slowly and require at least nine months to complete their development. Developing galls contained large larvae in March, pupae in April and yielded adults in late April and early May. At this time, adult females could be taken as they oviposited into the new leaf buds and stem growth. Infestation was quite heavy on some trees and in many instances, the new growth was severely damaged or completely killed. This is the first Neuroterus to be described from Quercus chrysolepis or from related oaks in this group. Insects of this genus had previously been known from galls on white oaks only. This species shows distinct differences in sculpture from other Pacific Slope members of the genus. 

Locality. — Specimens in the type series were collected at Pasadena, California. 

Andricus reticulatus

Hosts: Quercus engelmanni

This species, originally described by Bassett, 1890, has been recorded from a number of white oaks in the Southwest (Arizona, New Mexico and West Texas). The cynipids of the Southwest have been considered to be sharply separated from those of the Pacific Slope; therefore it is surprising to find this species producing galls on Quercus engelmanni Greene in Southern California (Fig. IB). Specimens were collected on a number of trees near Los Angeles and Pasadena with the insects emerging in late February. Infestation was particularly heavy on some trees, usually younger ones, and in several instances, the trees were nearly defo¬ liated. Female wasps were ovipositing in the unopened buds on 23 February in La Canada, California. These sites were marked with colored thread and with the opening of the new leaves, 23 March the young galls were immediately visible. The young galls were covered with pinkish, white hairs and growth was rapid so that galls were full sized by 23 April although the developing larvae were still small. The appearance of the new galls only one month after emergence of the adults indicates that an alternate bisexual generation does not exist in this species, at least in this area. The adult females were compared with paratypes of Andricus reticulatus Bass, from New Mexico and they appear to be the same, although the notaulices are incomplete in some specimens from Quercus engelmanni. Lewis Weld collected this California Andricus reticulatus many years ago and his notes indicate that he could not separate it from Arizona specimens. Figure 172 in “Cynipid Galls of the Pacific Slope,” Weld, shows the gall as an undescribed species but notes similarity to Andricus reticulatus Bassett and an Eastern species, Andricus petiolicola (O.S.). There are twelve specimens of the California reticulatus in the Weld collection. Charles Dailey has sent in females of this species from galls collected on Quercus turbinella Greene, ssp. turbinella Tucker growing at El Condor, Baja California, Mexico and also from a hybrid oak, Quercus dumo- sa x Quercus turbinella Greene, ssp. California Tucker growing at Gorman, Cal¬ ifornia. They are typical Andricus reticulatus Bass. 

Callirhytis lentiformis, new species

Host. —Quercus agrifolia Nee. 

Gall (Fig. 1F).—A spherical, deciduous, bud gall that drops to the ground in October. The galls resemble the galls of Callirhytis agrifolia Bassett but are much smaller and quickly shrivel to a biconvex, lens-shaped gall 3.5 mm in diameter. The galls contain large larvae at the time they drop from the tree but adults do not emerge until the following summer (July, August and September). 

Locality.— The type and paratypes were collected from Quercus agrifolia Nee growing in the San Gabriel Mountains north of Pasadena, California. 

New Cynipid Wasps from California (Hymenoptera: Cynipidae)