1919.] NATURAL SCIENCES OF PHILADELPHIA, 185 



with the frons brown and golden lanuginose medianly; orbits ciner- 

 eous. The seventh ventral with sublateral, rounded lobes, which, at 

 most, slightly overlap. 



The above specimens may be subauraia Lw,, or vitripennis Lw., 

 while albipennis Lw., may be represented by a series of 6cf, 12 9 

 from Cloudcroft, (May), Alamogordo, (April), Highrolls, (June), 

 East Las Vegas, (June), all of New Mexico, and Ysleta, Texas, 

 (April), this specimen differing from the above as follows: Dorsal 

 pile white; the lanuginose vesture not so yellow, that of the frons 

 in 9 being entirely silvery. 



The two forms seem to be more or less intergradant but may 

 prove to be distinct species upon more detailed study. 



Geron digitaria var. robusta new variety. 



Ranging larger than the typical form, and very similar except 

 that the pile of first antennal joint is white; of the dorsal surfaces 

 of the body, golden yellow as is also the lanuginose vesture above. 

 The lobes of the seventh ventral are somewhat pointed and are more 

 distinctly developed, apparently as separated developments of the 

 ventral segment. The male of this form may be difficult to separate 

 from those of digitaria, but the female certainly represents a distinct 

 variety. Length, 5-7 mm. 



Type. — 9 ; Hancock, Maryland, August 15, (F. R. Cole), [A. N. 

 S. P. No. 6208]. Paratype.—l 9 ; topotypical. 



Geron nivea new species. 



Similar to digitaria but all pile snow white; the lanuginose vesture 

 white and yellow mixed on the dorsum; middle tibiae pale. Geni- 

 talia of male broad when seen from above, with a lateral, subapical, 

 conical tubercle and a lateral subbasal spine-like filament. The 

 females have no golden tomen on the frons, and the lobes of the 

 seventh ventral overlap, appearing as a ventral segment. 



Type. — cf ; East Highlands, California, September 15, 1914, (F. R. 

 Cole), [A. N. S. P. No. 6209]. Paratype-s.—ld", 19; topotypical. 

 A male from Alamogordo, New Mexico, April, (Rehn & Viereck), 

 seems to be conspecific. 



A series of 6 cf , 3 9, Manayunk, Pennsylvania, Jamesburg, New 

 Jersey, and Linnieville, Maryland, July, (R. C. Shannon), are prob- 

 ably a variety of this species. The dorsal pile is yellow and the 

 lanuginose vesture yellow. 



Phthiria psi new species. 



This form runs to divisa in Coquillett's table {Trans. Amer. Ent. 

 Soc, xxi, 102) but differs considerably from that species. 

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