()82 FAMILY XXXIV. — IIETEKOCKHIIXT:. 



M<urony(hu'< <jJa])rnius Say, blackish. antcniKr pale reddish- 

 brown, seventh interval earinate, lenprth 3-;?.r> nnii., is known from 

 Pennsylvania. 



AncijroHy.v varicfjaiKS Germ., blaek, elytra" with yellow stripes, 

 length 3-3.5 mm., is recorded from the jMiddle States and Ten- 

 nessee. 



Family XXXIV. HETEROCERIDiE. 



Toe Variegated Mud-loving Beetles. 



To this family belong' a small nnmber of snbdeiiressed, oblong or 

 elongate, semi-aquatic beetles which live in galleries which they ex- 

 cavate in the sand or mud along the borders of streams and lakes. 

 When disturbed they run from their galleries and take flight, as do 

 certain species of Bevihidium. They are of a brownish or blackish 

 color, usually variegated with undulated bands or spots of dull .vel- 

 low, and have the body very finely punctate and densely clothed 

 with short, silky pubescence. From the Parnida", with which they 

 were formerly grouped, they differ mainly in having the front and 

 middle tibia' widened and armed with spines on the outer edge, thus 

 enabling them to burrow in the wet sand which they and their larva; 

 inhaliit. 



The Yinme Ileterocrriis, that of tlie typical and only genus, comes 

 from two Greek w^ords meaning "different" and ''horn." and was 

 so given from the irregularity of the ll-.Tointed antenuic, joints 5 to 

 11 of which form an oblonsr, serrate club (Fig. 4, No. 9). 



In addition to the characters mentioned, the members of the 

 family have the mentum large, obh-ng, deej^ly emarginate in front; 

 thorax transverse with rounded angles; prosternum lobed in front, 

 acute behind; mesosternum very short, deeply emarginate; elytra 

 entirely covering the abdomen, which is composed of five nearly 

 equal ventral segments, the fifth only being movable, the others 

 comiate; front coxa oval, transverse, the cavities widely open be- 

 hind; tarsi 4-.jointed, the second and third .ioints shoi'ter than the 

 others. 



The only j)aper treating of the Noi'th American species is that hy 



Horn. — "The Species of Heterocrrvs of Poi-ea! America," in 

 Trans. Amer. Entom. Soc, XVII. 1S90. 1-1 (i, pi. I. 



I. Heterogerus P>osc. 1702. (Gr.. "different -t liom.") 



In the paper above cited. Dr. Horn rednced the 16 species of the 

 genus listed by IFenshaw to nine, and added two new ones. One of 

 the j)rinci[)al eharaclcrs nsed by him in separating the species is the 



