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ENTOMOLOGICAL SOCIETY 



nearly twice shorter and 3 times narrower than the plate, curved forward, 

 tip acute, black. 



9- Genital segment but little longer than the preceding ventral seg- 



FIG. 10. Lalophya flavida : b, pupa, dorsal view; c, same, ventral view; d, O imago; 

 e, antenna of same ; f, genital segment of ^ ; g, stem of sumac with hibernating larvae. 



ment, upper plate gradually narrowed posteriorly into a short point; 

 lower plate hardly shorter than the upper one. 



This species lives exclusively on Rhtis glabra and seems to 

 be widely distributed ; specimens are before me from Massachu 

 setts, Washington, D. C. (collected in May), and from St. Louis, 

 Mo. 



Type. No. 8148, U.S. National Museum. 

 Calophya nigripennis Riley (rhois Glover, nee Fr. Loew). 



Length 2 mm. Vertex, wings, and four anterior femora black, abdo 

 men more or less infuscate, frontal processes and thorax bright orange- 

 yellow or sulphur-yellow, antennae, except at tip, posterior femora and all 

 tibiae pale yellow. Head usually shining and impunctate, sometimes less 

 or not shining and finely alutaceous ; vertex distinctly shorter than in 

 Jlavipennis, more suddenly rounded anteriorly, discal impressions small 

 or large, frontal processes shorter than in flavida, cone-shaped, as long 

 as wide at base or even a little shorter, more or less strongly divergent, 

 obtusely pointed at tip; antennae as in flavida but the tip is always de 

 cidedly black even in immature specimens. 



Thorax unicolorous, rarely with faint traces of darker markings, some 

 times shining and nearly smooth, sometimes hardly shining and trans 

 versely strigose. 



