18 GEO. H. HORN, M. D. 



This species will be easily known by its form, which is only a little 

 less robust than Cose, dominicana and by the very smooth disc of 

 the thorax. 



Occurs in Texas, Arizona and southern California. 



IVotes on AMARA s. g. TRI^NA. 



BY GEO. H. HORN, M. D. 



The division Triiiena includes those Amarae in which the terminal 

 spur of the anterior tibia is trifid in both sexes. The posterior tibiae 

 of the males are pubescent on the inner side, as in Atnara proper, 

 but not so densely. In all the species the tip of the prosternum has 

 a distinct marginal line. The thorax at base has a marginal line 

 which extends from the angle one-third inwards. The scutellar stria 

 terminates in an ocellate puncture. 



The species are few in number, and may be separated in the fol- 

 lowing manner : 



Anteunse piceoiis, except the three or four basal joints. 

 Legs entirely rufo-testaceous. 



Hiud angles of thorax obtuse; tarsi entirely pale; fourth joint of antennse 



in great part pale aiigustata. 



Hiud angles of thorax sharply rectangular; tarsi semi-piceous; fourth joint 

 of antennae almost entirely picieous. 



Sides of body beneath and abdomen smooth ]>»lli|>es. 



Sides of body beneath and abdomen coarsely sparsely punctate.. loiigulsi. 



Legs in great part piceous scitula. 



Autennse and legs entirely rufo-testaceous .....Beirragei. 



The first two species belong to the Atlantic fauna, the next two to 

 the Pacific region, while the last is known to me from Texas only. 



A. aiigustata Say. 



The smallest of the species of the group. The hind angles of the 

 thorax are quite obtuse, and there is no distinct oblique impression 

 of the disc near them. The under side of the body is smooth. 



Occurs from Canada southward, and from the New England 

 States westward nearly to the Rocky Mountains. 



A. pallipes Khy. 



More elongate in form than angustata, and with the hind angles 

 of the thorax rectangular, the sides of the thorax parallel for a short 

 distance in front of them. There is a distinct oblique impression 

 near the hind angles. Under side of body smooth. 



