64 



E. P. VAN DUZEE. 



vures slender, brown, marked with larger brown spots at their junc- 

 tion with the margin ; calloused edge of the scutellum marked with 

 five white spots, one of which is on the tip. These are the ordinary 

 markings, modifications of which will be found in most of the species. 



Structurally, this genus difl^ers but little from Aihysanus, and it is 

 possible that the group, including strobi and Uhleri, should also in- 

 clude Aihysanus seminudus Say, but the more typical forms have the 

 anterior edge of the head acute, or at least well diflferoitiated from 

 the vertex, and approach more closely Selenocephalus and Fieberiella. 



It will be noticed that the species here described fall into two 

 well defined groups. In the smaller and more typical of these, the 

 head is distinctly narrower than the pronotum, the vertex is convex, 

 not depressed, the anterior edge obtuse ; clypeus large, well expanded 

 apically, with a convexly arcuated base fitting into the emarginate 

 apex of the front. This group includes the European species and 

 our species Nos. lo to 18. In the larger group the head is little, 

 if any, narrower than the pronotum, the vertex is more or less dis- 

 tinctly transversely depressed, usually with an acute anterior edge, 

 and the base of the clypeus is little, if at all, arcuated. Here belong 

 our species Nos. 2 to 14. In P. latifrons the vertex is extremely 

 short and rounded. Bythoscopus stipatus Walk. (Homop. Brit. 

 Mus. iii, p. 874) may pertain to this genus, but it is impossible to 

 recognize the species from his description. 



For the loan of material in this genus I am especially indebted to 

 Mr. P. R. Uhler and Prof Herbert Osborn, both of whom have 

 sent me very full series from the South and West. I also wish here 

 to express my indebtedness to M. Lucien Lethierry,of Lille, France, 

 who very kindly supplied me with European material for comparison, 

 and to Mr. Samuel Henshaw, of Cambridge, Mass., for studying for 

 me the typical specimens in the Harris collection ; also to my various 

 correspondents who have favored me with the use of their material 

 in this genus. 



Genus Phlepsms, with but seven palsearctic species, and those of 

 rare occurrence, forms a conspicuous member of the North American 

 Jassid fauna. At least twenty species are known to me, of which 

 eighteen are here described, and many niore may yet be found in 

 the southwestern States and on the Pacific coast. Many of these 

 are closely related, and it may puzzle the student to distinguish be- 

 tween them. The best characters for this purpose are: the form of 

 the facial pieces, the sculptuation of the pronotum, and the form of 



