NORTH OF MEXICO. 



34!) 



(). aoiculatus, Lee, Proo. Aoad. 1858, 75. 



Differs from the preceding in having the elytra distinctly striate, strise with large; punc- 

 tures, interstices moderately convex. Thorax more strongly rounded than the preceding, 

 with the sides distinctly reflexed, and with the disc more convex. 



Occurs abundantly in Texas. 



Length .40 inch. 



(). sayi, oblong, parallel, brownish opaque. Head finely and densely punctured; olypeus rather deeply emargi- 

 nate. Thorax feebly convex, one-fifth broader than long, sides moderately rounded in front, nearly straight and 

 slightly divei'gent toward the base; apex feebly emargtnate, base Insinuate; surface opaque, very finely and densely 

 punctured, lateral margin slightly thickened. Elytra sub-parallel, feebly convex, opaque, not deeply striate, and 

 with punctures neither approximate nor deeply impressed; interstices slightly convex and very minutely punctured. 

 Body beneath ferruginous, shining. Length .40 inch; 1.1.5 mm. 



One specimen from Kansas, kindly given me by Mr. P. S. Sprague, of Boston. 

 Our species of Opatrinus may be known as follows : 

 Thorax very finely punctured; inner side of male anterior tibiae distinctly 



sinuate. s a y i . 



Thorax coarsely punctured; anterior tibia) of male slightly arcuate only. 



Elytra not striate, but with rows of large deeply impressed punctures, n o t u s . 

 Elytra striate ; sides of thorax slightly reflexed. a c i c u 1 a t u s . 



GROUP U — BLAPSTiNT. 



This group differs from the preceding in having the eyes entirely divided. As in the 

 previous group, the anterior and sometimes the middle tarsi are dilated in the male, and 

 the anterior tibiae are also somewhat curved in the same sex ; in some of the genera, how- 

 ever, the dilatation is but little apparent. The tibia? and femora of both sexes in all the 

 genera are entirely unarmed. Notwithstanding the number of genera proposed by Mul- 

 sant in this group, it has been found necessary to add several new ones. 



The following table will give their differences : 

 Anterior tibia; with the outer angle obliquely truncate. 



Intercoxal process of abdomen triangular, acute or oval at tip. 



Antenna? long, slender. MECYSMUS. 



Antennae stout, joints 4-8 broader than long. conibius. 



Antenna) stout, joints 4-8 longer than broad. blapstinus. 



Intercoxal process broad truncate at tip. notiisius. 



Anterior tibia; with the apex emarginate, outer angles prolonged. 



Tibia; broad, not linear. ULtf'S. 



MECYSMUS, n. g. 

 This name is proposed for a species differing from the other Blapstini by its elongate 

 depressed form, thorax sub-quadrate, narrower at base than the elytra. The antenna; are 



AMERI. l'HILOSO. SOO. — VOL. XIV. — 88 



