24 THOS. L. CASEV. 



parallel, then suddenly acuminate at tip. Protliorax widest slightly before 

 the middle, where it is very slightly wider than the head ; sides parallel and 

 Hvenly arcuate for two-thirds tlie length posteriorly, then rapidly convergent 

 and feebly sinuate ; anterior margin slightly longer than the posterior, 

 equally arcuate ; disk evenly convex, slightly more than one-third wider 

 than long, punctures coarse, deeply impressed, round, evenly distributed, 

 interspaces slightly wider than the punctures, slightly convex and highly 

 polished ; near the base, and equidistant from the middle and each basal 

 angle, there are two longitudinal erosions or aggregations of deep coalescent 

 punctures. Elytra at base just perceptibly wider than the pronotum ; sides 

 rather feebly divergent posteriorly, slightly shorter than the width at base, 

 evenly and somewhat strongly arcuate ; together broadly, somewhat angu- 

 larly and moderately emarginate behind ; suture about four-fifths as long as 

 the pronotum ; surface narrowly and rather strongly impressed along the 

 suture, feebly and sparsely punctulate ; minutely granulose area near the 

 inner apical angles impunctate as in similix and robustuhis; sutural striae 

 deep. First two abdominal segments slightly broader than the contiguous 

 elytra ; surface minutely reticulated and feebly lustrous ; border strong, 

 except on the fourth and fifth segments, where it is almost obsolete. Legs 

 moderate. 



Mule. — Unknown. 



Female. — Sixth ventral segment angularly rounded behind. 



Length 1.3 nmi. 



Cambridge, Mass.; one specimen. 



Greatly resembles siinilis, but differs in the narrower thorax, less 

 divergent elytra, longer elytral suture, and more feeble emaigination 

 of the elytra behind. The principal distinction, however, is in the 

 lateral border of the fourth and fifth ventral segments, it being almost 

 obsolete and reduced to the simple line of juncture of the dorsal and 

 ventral surfaces in niimdulns, while in similis tlie border is very wide 

 and strong on the fourth segment, and narrower, though still very 

 distinct, on the fifth. 



The minutely granulose portion of the elytra is always of a paler 

 tint tiiaii the remainder of the disk ; this may be a simple o|)tical 

 phenomenon, arising from the dispersion of the rays of light ; the 

 satne difference is seen in the color of a rough stone and the same 

 when polished, it being then much darker. 



G. E. roblistiiliis n. sp.— Form robust. Pubescence rather short and 

 abundant, evenly distributed, fine, semi-erect, pale piceous. Color of head, 

 l)i<.tli(.rax, and abdi>mon rather dark reddish-testaceous, base of elytra dark 

 castaneous, remainder of elytra rufous. Head large, very slightly wider 

 than long; interocular surface strongly and irregularly punctured, punc- 

 tures crowded near the sides, much more loosely scattered along the middle, 

 round, sub-variolate; antennal tuberculations small and very prominent; 

 antennae moderate, third joint one-third longer than the fourth, fourth and 



