H. C. FALL 600 



Ahdominalis is as a rule slightly larger and more robust, of a 

 pale grayish yellow color, the head and thorax with at least traces 

 of the standard spots, Init the elytra without markings — at least 

 none are mentioned either in the short diagnosis of Say or in the 

 longer description by Suffrian, who had seen an authentic example 

 from Say in the Germar Collection. 



Peccans averages a trifle smaller, the yellow color somewhat 

 variable, frequently a little brighter in tint than in ahdominalis 

 but often not so, the black markings of the head and prothorax 

 distinct, often large, the elytra nearly always with at least traces 

 of spots, and not infrequently more black than yellow. 



Diversus is somewhat smaller, typically, and indeed almost 

 always of a brighter yellow than ahdominalis. Many specimens 

 are as free from markings as ahdominalis, but in others the upper 

 surface throughout is more or less varied with rust red to fuscous 

 shades, and some of the more distinctly marked forms are so 

 like lightly marked western specimens of peccans as to be scarcely 

 distinguishable. 



38. Pachybrachys diversus new species 



Yellow, minutely alutaceous, scarcely or slightly shining, 

 Ih'owu punctured, markings usually pale rust colored and feeble 

 or nearly wanting, but sometimes darker and more distinct; 

 ocular lines distinct, moderately distant from the eyes; front 

 claws evidently enlarged in the male. Ave. length 2.9 mm. 

 Illinois to Nebraska and south to Texas. 



Head unevenly punctured, spots feeble and due chiefly to the grouping of 

 the brown punctures. Eyes separated in the male by a little more than twice 

 the length of the basal antennal joint, or by a distance subequal to or slightly 

 greater than the vertical width of the upper lobe of the eye; in the female by 

 about three times the length of the basal joint of the antennae. Antennae 

 thin, outer joints more or less dusky, attaining the apical third of the elytra in 

 the male and the hind coxae in the female. 



Prothorax moderately transverse, widest and moderately strongly arcuate 

 sHghtly before the base, the sides a little retracted behind, distinctly conver- 

 gent and broadly rounded or nearly straight anteriorly; disk rather coarsch', 

 unevenly and not very closely punctate, side margins smooth; standard spots 

 obsolete or represented by feebly developed and diffuse reddish brown shades. 



Elytral striae a little impressed, more or less sinuous — the fifth and sixth 

 generally the most irregular — but fairly well defined except in a rather small 



TRANS. AM. ENT. SOC, XLI. 



