Callirhytis reticulata

Andricus reticulata

Cynipidae

Andricus

Quercus ajoensis

Arizona

Colorado

New Mexico

Quercus arizonica

Texas

Quercus engelmannii

California

Quercus gambelii

Nevada

Oklahoma

South Dakota

Utah

Wyoming

Quercus oblongifolia

Quercus rugosa

Quercus toumeyi

Quercus turbinella

Quercus vaseyana

Cynipid galls of the southwest

Cynipid Galls of the Pacific Slope

New Cynipid Wasps from California (Hymenoptera: Cynipidae)

Andricus reticulatus (sexgen)

A. (Callirhytis) reticulata n. sp.

Polythalamous galls on the midvein and near the base of small oak leaves from what is probably one of the dwarf varieties of Q. virens. Prominent on both surfaces, but more so on the underside. They are almost round and (dried specimens) one-fourth of an inch in diameter. The dry galls are exceedingly hard, and they bear a very close resemblance to those of A. cicatricula, though the scar or indentation invariably found in that species is wanting. The larval cells are not separable from the solid woody fibre around them, and they all radiate from a common centre. 

My galls, collected by Mr. Howerton in New Mexico, have produced no males, but I do not look upon this as an agamous species. 

New Species of North American Cynipidae (1890)

[Listed by Weld as undescribed, synonymized to A reticulatus by Lyon]

Quercus dumosa, engelmanni
Leaf galls, integral
Globular with a scar above, solid, smooth, dia 10 mm, on midrib or petiole on basal third of leaf, green or brown. Fig 172. Resembles [petiolicola](https://www.gallformers.org/gall/770) or reticulatus on the white oaks in Arizona. 

Fig 172. Unknown. On Q-dumosa and engelmanni. Solid, greenish, with a scar at apex. Resembles gall of Andricus reticulatus Bass. from a dwarf oak in N. Mex. and that of Andricus petiolicola (6.5.) in eastern U. S. Contained living adults on March 2 (Boulevard).


Andricus reticulatus

Quercus arizonica, oblongifolia, toumeyi, reticulata [rugosa], gambelii, subturbinella [turbinella]
Leaf galls
Integral
Fig 179.

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. 

Andricus reticulatus
Olive-leaf-gall wasp

Hosts: Quercus arizonica, oblongifolia, toumeyi, gambelii, rugosa, turbinella

Galls are generally round and protrude about equally on both surfaces of the leaf.

Plant Galls of the Western United States

Quercus ajoensis added as a host tentatively based on [this observation](https://www.inaturalist.org/observations/81502021). 

Quercus lobata added tentatively as a host tentatively based on [this unconfirmed observation](https://www.inaturalist.org/observations/109981713). 


Gallformers ID Notes