CHARLES W. METZ. 137 



nated on the outer margin near base, forming a narrow lobe. 

 At or near the apex of the wing is some form of a membra- 

 nous flap, (differing in the different species), which usually 

 extends beyond the body. No pubescence is found on the 

 plate except a slight amount on the basal lobe ; and there 

 are no tooth-like projections whatever on the outer margin. 

 The eighth ventral plate always has apical lobes, but never 

 the horn-like processes of the Cressoni Division. The geni- 

 tal armatures have no uniform characters to separate them 

 from those of the other groups ; but usually they are more 

 slender and delicate than the others. 



The face markings of this division are of two types ; one 

 in which the lateral marks are very large, and broaden out 

 above the antennal sockets, as in asi?ii7iHs ; and the other in 

 which the face is broad above, and narrowed suddenly below, 

 causing the lateral marks to diverge suddenly, or at least 

 noticeably, above the level of the antennal sockets, as in P. 

 ix'ootoni. The group is not so compact as either of the other 

 two in markings or genitalia. Three species {nevadensis, 

 cookii n. sp. and calvus n. sp.) are included here which are 

 quite different from the rest and from each other, in geni- 

 talia, but their relationship is shown without question in other 

 characters. All of the species in this division are compara- 

 tively small, and are apparently found only in the Western 

 States, where some become quite abundant. 



PROSOPIS ASININUS Ckll. and Csd. 1895. 

 1895. P. asi?nnus, (male), Ckll. and Csd. Tr. Amer. Ent. Soc. 

 22 : 299. 



1895. P. bipes. (female), Ckll. and Csd. Tr. Amer. Ent. Soc. 



22 : 300. 



1896. P asinimis, Ckll. Psyche Supp. 7 : 30. 

 1898. P asininus. Ckll. Ent., 1898, p. 217. 



Male. — Small species ; distinguished by its long, narrow face, with 

 long large lateral marks, and by its heavily punctured abdomen. 



Length about 5 mm. 



Sculpture. — Punctures of front, vertex, and occiput enormous for the 

 size of the insect, confluent, almost pit-like in places, becoming sparse 

 on cheeks. Those of mesoscutum large, rather close, but not con- 

 fluent ; of scutellum similar but a trifle larger and more sparse ; meta- 

 notum very short, one-third the length of scutellum ; with few large, 



TRANS. AM. ENT. SOC, XXXVII. (18) 



