152 Journal New York Entomological Society. [Voi. viii. 



The antennas are of a different type of structure from that pre- 

 vailing elsewhere in the tribe, the club being 6- to 8-jointed and 

 generally loose and serriforni in the males, and 4-jointed and regular 

 in the females. The prosternum is not so strongly defiexed at apex 

 as in Perimegatoma, and the process between the coxfe is wider, the 

 mesosternum between the coxas \ery much wider, transverse and 

 divided throughout by a broad deep sulcus. 



Dr. Jayne was mistaken in his diagnosis of the species of the 

 sfenialis group in two important particulars. The mesosternum is as 

 completely and widely divided by the median sulcus as in the others, 

 but the metasternal process is rather more arcuate, and the broad flat 

 marginal bead usually extends along the apex throughout the width ; 

 this misled the author in determining the true anterior limit of the 

 metasternum. The author also failed to observe the true structure of 

 the male antennse, the very minute third joint giving rise to the ap- 

 pearance of a lo-jointed condition, which is alluded to as a general 

 fusion of the tenth and eleventh joints in the male (Proc. Am. Phil. 

 Soc, XX, p. 363). 



The species are quite numerous and those before me may be thus 

 briefly characterized : — 



Eyes entire, the inner frontal margin not sinuate; antenn;^ serrate in the male 2 



Eyes sinuato-emarginate at about the middle of their inner frontal edge ; male antennte 

 compact, not serrate, the third and fourth joints subequal and transver.se ; prono- 

 tum minutely, sparsely punctate, becoming strongly and more densely so toward 



the sides 14 



2 — Male antennae with the third and fourth joints equal in size 3 



Male antennte having the third joint minute and very much smaller than the fourth. .10 



3 — Body more elongate in form, the elytra nearly one-half longer than wide 4 



Body stout and broadly oblong-oval, the elytra one-fourth longer than wide or even 



less 9 



4 — Submedian testaceous band of tlie elytra crossing the suture at the middle of the 



length ; species small and inhabiting the Eastern and Gulf States 5 



Submedian testaceous band crossing well behind the middle of the length ; species 



much larger and inhabiting the Pacific States 8 



5 — Pronotum strongly and rather closely punctate, especially toward the sides ; pubes- 

 cence persistent 6 



Pronotum very minutely and sparsely punctate throughout, the pubescence readily de- 

 nuded 7 



6 — Elytra black, with the usual piattern of fine irregular rufescent bands clothed with 

 paler hairs ; vestiture of the pronotum much variegated. Length 3.0 mm.; width 



1.65 mm. Iowa (Keokuk) ; \ piisilla Lee] ornata Say 



Elytra and pronotum almost similarly colored, and with the variegated pubescence 



