AMERICAN HEMIPTERA. 13 



^Alacostethus siinulans Uhler. 



Recorded from California only. I have not yet seen it. 



Genus HOM<EWlJS Dallas. 

 The following key refers only to the four species known to me : 



Dilated anterior margin of the prostethns when viewed vertically from below 

 forniinK a distinct hut obtuse angle beneath the antcnniferous tuber- 

 cles; posterior half of the lateral margin of each ventral segment 

 black proteu!ii . 



Dilated anterior margin of the prostethus rounded 1. 



1. Osteolar canal regularly cui'ved at apex, not abruptly bent ; size small, color 



pale {(■'^■(■■"icu!^* 



Osteolar canal abruptly bent forward at apex nearly parallel to the outer 

 margin of the metapleura 2. 



2. Latei'o-anterior margins of the pronotum concavely arcuated ; aiiterioi' pi'o- 



longation of the 6th ventral segment broader, distintly angled ; head 



generally bronze-black, without pale markings ieiieifroilS. 



Latero-anterior margins of tlie pronotum straight or feebly con vexly aictiated ; 

 anterior prolongation of the 6th ventral segment narrower, distinctly 

 rounded ; head generally with a broad submarginal pale vitta. 



bijugis. 

 Hointenius ieneifrons Say. 



This is a widely distributed and in some localities an abundant 

 species. I have never been able to detect it al)out Buffalo, but have 

 taken it in numbers at Lake Placid in the Adirondacks. It occurs 

 all through New England, and in Canada it is distributed from 

 Q,uel)ec to Vancouver Island. In the Rocky Mountains it spreads 

 southward to New Mexico, where it has been taken by Dr. Skinner, 

 and Distant records it from Mexico. On the eastern side of the 

 continent it extends along the Alleghany Mountains into Maryland 

 and Virginia. 



Hoiii<)einii»<i UiJugiK Uhler. 



This species is very close to the preceding. After a careful ex- 

 amination of a long series of specimens from various localities, I 

 have, however, found two characters that seem quite constant, and 

 may perhaps serve for separating these forms. In ceiieifrons the 

 anterior prolongation of the sixth ventral segment is distinctly 

 broader, with the angles more pronounced, and in the male with its 

 anterior margin feebly produced in the middle. In bijugix this 

 anterior prolongation is narrower and more rounded before. In 

 bijugis also the submargins of the head have a broad, pale vitta, 

 and the general color is paler, with the mai'kings al)ove moi'e clearly 



TRANS. AM. ENT. SOC, XXX. .JANUARY, 1904. 



