24 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



Most of the western individuals seem to belong to this species, while 

 most of the eastern forms are typical vernalis. It is interesting 

 to note, however, that in Pennsylvania and Maine five specimens 

 have been taken which seem to belong to the western species. It is 

 possible that these two species represent only one very variable 

 species which is distributed over the entire country, and varying in 

 the different geographical localities. 



The specunens from Placer and Siskiyou Coimties are a little 

 smaller and superficiary a very little different in appearance, and 

 bear the manuscript name of Livia subtruncata Riley. These, how- 

 ever, seem to belong to the species caricis. 



Tribe APHALARINI. 

 Genus RHINOCOLA Forster. 



This genus is not represented in the American fauna, but it is given 

 a place in this work because of its significance as a connecting form 

 between Livia and Aphalara. Many of the species described in this 

 genus are not congeneric with the type-species, B. aceris Linnseus, 

 and must be referred to other genera. 



An examination of Rhinocola aceris (figs. 29, 30, 31, 219, 273, 428) 

 will show the many transitional characters which it possesses, inter- 

 mediate between the two genera above mentioned. The head and 

 dorsum are very slightly arched ; the vertex is flat, about as long as 

 broad; the frons and gense resemble both genera; the antenna3 are 

 short and thickened. The pronotum is intermediate between the 

 two genera, extending far down laterad but not as far as in Livia, 

 with the pleurites shorter than in Aphalara, but of similar form. The 

 wings show some peculiarities of both. 



Genus APHALARA Forster. 



Notum not strongly arched, often almost flat; head usually scarcely 

 deflexed; vertex flat, more than half as long as broad, lobes somewhat 

 rectangular but rounded in front, making an emargination between 

 them; frons not covered by genae, but narrow and elongate as in 

 Livia, with front ocellus at its anterior end; gensB not swollen into 

 cones, but often roundly swollen on each side of frons; clypeus pyri- 

 form, rather large. Antennae short, never more than twice as long 

 as width of head, often not at all longer than width of head, ten or 

 nine segmented (usually the former). 



Pronotum rather long, with two foveas on each side, and a knob- 

 like lateral termmation; pleurites very short, quadrate; pleural 

 suture straight, extendmg to middle of lateral termination of pro- 

 notum; prsescutum rather short; scutum large. Hind tibiae without 

 spur at base, with six to nine black spines at apex; basal tarsus 



