ROLAND HAYWARD. 57 



A very pretty species, distinct from its allies by the characters 

 above given. The humeri of the elytra are more nearly rounded 

 than in the others of the grou]3, of which it is the only species in which 

 the hind angles of the thorax are acute. The ill-defined pale spot 

 on the elytra, above mentioned, is visible in all the specimens exam- 

 ined. 



It is known to me only from Lowell, Mass., where it has been taken 

 in moderate abundance by Mr. Frederick Blanchard, to whom I 

 am indebted for the series in my cabinet, and to whom it gives me 

 pleasure to dedicate this species. 



Group vi. concolor. 



Maxillse with the outer lobe bi-articulate. Frontal grooves single, 

 straight, parallel ; eyes moderately large and prominent. Prothorax 

 subquadrate or quadrate, truncate at base. Elytra with two dorsal 

 punctures on the third stria ; humeri rounded ; eighth stria distinct 

 from the margin. 



This group may be distinguished from the last by the rounded 

 humeri of the elytra, while from the next it differs in having the 

 eighth elytral stria distinct from the margin. It includes LeConte's 

 sixth and seventh groups, that author having placed nigrum in a 

 group by itself, based u})on its more convex form, with nearly all the 

 strise of the elytra a!)breviated behind. The striation, however, 

 varies in the different species, all the stride being entire in concolor 

 and rectieolle, while in quadralum and longulum the outer ones are 

 slightly effaced at tip. Finally, in hrevistriatum they are represented 

 by rows of rather sparsely placed, large punctures which do not 

 attain the apex. 



The six species known to me may thus be separated ; 



Robust, very convex; nigro-ieneous, the elytra often tinged witli green ; thorax 

 one-half wider than long, narrower at base than apex; elytra deeply 

 striato-punctate, the strise dilated, the first and second entire, the others 

 abbreviated behind, the fifth represented by a groove at tip ; base of 

 autennpe and legs rufous. Length .15-. 18 inch iiigriiin Say. 



Slightly elongate, convex; black, slightly feneous; thorax less than one-half 

 wider than long, narrower at base than apex ; strife of elytra composed 

 of rather sparsely placed, large punctures not attaining the apex; base 

 of antennae and legs rufous. Length .15-. 17 inch. 



brevistrisiliiiii n. sp. 



Less convex; elytra with at least the two inner stria; and the fifth or seventh 

 entire. 



TRANS. AM. ENT. SOC. XXIV. (8) FEBRUARY, 1897. 



