472 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



standard spots distinct, the inner ones more or less confluent, to entirely black; 

 often black with an apical red spot or vitta extending forward a variable dis- 

 tance. 



Pygidium, body beneath and legs black. 



Length 3.5 to 4.5 mm.; width 1.9 to 2.6 mm. 



Distribution. — Texas: Sparingly represented in most of the larger collections; 

 with a single exception — "Round Mt." (Wenzel Coll.) — all examples, including 

 the type female, bear simply the label "Tex.," or "S. W. Tex." Kansas: 

 (Horn Coll.). Oklahoma: Stillwater (Nat. Mus. Coll.); a variety, almost 

 entirely pale, is somewhat doubtfully referred. 



This species goes as subviUatus in some collections, and in others 

 as hybridus. It is in most of its color forms exactly intermediate 

 between the two. From hybridus it may be distinguished with 

 certainty by the small front claws of the male; it is also more 

 robust, the prothorax is as a rule more densely and a little more 

 coarsely punctate and the antennae are much less slender and 

 elongate. Some males of instabilis approach subviUatus in 

 color and markings, but the latter is truly yellow with a dis- 

 tinctly shorter prothorax which is trivittate, the median vitta 

 divided in front, and the legs are pale. 



153. Pachybrachys hybridus Suffrian 



Black; prothorax red, varying to black with red side margins, 

 moderately shining. Eyes separated in the male by one and one- 

 third (more or less) times the length of the basal antennal joint, 

 and by about twice the length of the basal joint in the female; 

 ocular lines wanting; front claws of male very large. Ave. length 

 3.75 mm. California and Texas. 



Head moderately punctate; eyes not at all prominent, separated in the 

 male by a distance subequal to the vertical width of their upper lobes. Anten- 

 nae very long and thin, nearly as long as the entire body in the male, black, 

 more or less reddish brown toward the base, tenth joint four times as long as 

 wide in the male and three times as long as wide in the female. 



Prothorax moderately long, rather strongly narrowed in front, widest before 

 .the base, sides rounded in basally; punctuation fairly close, median line nar- 

 rowly incompletely smooth, side margins narrowly subimpunctate, expecially 

 posteriorly. 



Elytra coarsely confusedly punctured in a rather large baso-sut m-al triangle, 

 striate more or less irregularly at sides and rear, the striae moderately im- 

 pressed; shield small but evident, marginal interspace with a few punctures 

 near the subbasal interruption of the eighth stria. 



Length 3.3 to 4.2 nun.; width l.S to 2.3 nun. 



