Pachypsylla celtidispubescens

Gall: Above a simple cup-shaped pubescent depression; below spherical, 2 to 3 mm in diameter, covered with white hairs even when the leaf is nonpubescent, green in color until fall then brown.

Hosts and distribution: This species appears to be essentially restricted to the range of C. reticulata. A few galls were found on C. laevigata; these had the same morphology as those found on C. reticulata. As mentioned these galls were found to be very numerous on the introgressed hackberries of northwestern Oklahoma, again with typical morphology in both the galls and the gallmakers.

In Texas galls of P. celtidispubescens were collected at widely separated sites in the western part of the state from Alpine to the Panhandle. In these collections it was found in large numbers only in the Davis Mountains and In that part of Texas adjoining northwestern Oklahoma as well as at a few other scattered sites. In many collections it was not found at all or in very low numbers. For example only a very few specimens were found in the areas around Amarlllo and Lubbock. It was not found in the area of Austin nor in other areas where C. laevigata is the common type of hackberry.

P. celtidispubescens and P. celtldismamma are sympatric in northwestern Oklahoma and adjacent areas of Texas where they often occur on the same trees.

Pachypsylla celtidispubescens [not listed in the key in which Yang provides gall descriptions, included in Table 1-2 listing described species without endorsing their validity or updating info]

Celtis reticulata

Southwestern U. S., e.g. TX, OK, CO, MS.

Conclusions about the status of several additional described nipple gall makers, including P. celtidispubescens, P. rohweri, P. celtidisglobulus, P. celtidiscucurbita and P. celtidiscucurbita var."?", can not be made, since they were not included in this study.

Pachypsylla celtidis-pubescens n. sp.

This gall on the upper side of the leaf is represented by a small circular cup-shaped impression, surrounded by a rather wide, thickened, and elevated margin, and furnished at the bottom with a small, usually star- shaped, median nipple. The bottom and sides of the impression are smooth and shining, and occasionally beset with a few scattered hairs; the elevated margin is coarsely rugose-plicate, and usually also shining. Average diameter of gall, including elevated rim, about 3 mm; without the latter, nearly 2mm. On the under side of leaf it is usually semi- globular, entirely sessile, sometimes more flattened, rarely more globular and then less sessile. Surface more or less rugose, not shining, and covered with long but not densely placed white woolly hairs. There is sometimes a small apical nipple surrounded by a slight depression. Average diameter, 3 mm. Color pale greenish-yellow. The walls are very thin, but much thicker than the leaf itself; the roof is straight and the cell comparatively large and crescent-shaped in a cross- cut. Mode of issuing of mature pupa as in the preceding.

Pachypsylla pubescens

Subglobular, sessile, smaller leaf gall with long hairs and with a smooth, shining impression on the upper surface, diameter 3 mm.

Pachypsylla celtidispubescens Riley, 1890

Pachypsylla celtidis-pubescens Riley, 1890. USDA Bull. 7:620.
Pachypsylla celtidispubescens: Riemann, 1966 [emendation]. Ann. Entomol.Soc. Am. 59:1089.