NORTH AMERICAN BOSTRICHIDAE 83 



In the original description, Casey states that the insect is black, but 

 on examining the type, it was found to be dark reddish brown. 



Genus HETEROBOSTRYCHUS Lesne 



Eeterobostrychus Lesne, 1899, Soc. Ent. de France Ann. (1898) 67: 443, 554-565: 

 1901, Abeille 30: 86, 93-94; Jakobson, 1913, Kafer Russland, pt. 10, pp. 803, 

 ,805 ; Lesne, 1924, Bostrychides de l'Af rique Tropicale Frangaise, pp. 114, 133- 

 137; 1938, in Junk (pub.), Coleopt. Cat., pt 161, pp. 37-38. 



Head convex on vertex, transversely flattened behind eyes, deeply 

 inserted in prothorax, not visible from above ; clypeus long, strongly 

 transverse, convex or flattened, truncate or emarginate in front, ante- 

 rior angles obtuse or rectangular ; clypeal suture obsolete or distinct 

 at middle ; labrum short, strongly transverse, subtruncate and densely 

 ciliate with long, yellow or brownish hairs in front ; margins of buccal 

 cavities not dentate below eyes; mandibles more or less attenuate 

 toward apices; eyes round or oval, sometimes globose, strongly pro- 

 jecting. Antenna short, 10-segmented ; first and second segments 

 robust, first oblong, second oval, shorter than first; third to seventh 

 segments short, narrow, round or transverse; subequal in length to 

 one another; last three segments forming a broad, loose, compressed 

 club, each with two small, round, sensory depressions on each surface, 

 eighth and ninth segments subtriangular, subequal in length to each 

 other, tenth equal to, or slightly longer than ninth, round or oblong, 

 sometimes narrower than ninth. Pronotum strongly convex, truncate 

 at base, emarginate in front, dentate anteriorly, transversely depressed 

 behind anterior margin ; sides not margined ; posterior angles round, 

 obtuse or rectangular, sometimes lobed and projecting. Scutellum 

 small, quadrate. Elytra strongly convex, without distinct longitu- 

 dinal costae, sinuate or truncate at base, with or without tubercles 

 on apical declivity. Legs short, subequal in length; tibiae slightly 

 expanded toward apices, anterior pair dentate on exterior margins, 

 each with a large arcuate spine at apex; posterior tarsi as long as 

 tibiae, apical segment of each shorter than preceding four segments 

 united. Anterior coxae contiguous. Middle coxae narrowly sep- 

 arated. Posterior coxal cavities completely margined on first visible 

 abdominal sternite. Intercoxal process of abdomen tubular or nar- 

 rowly triangular. Body elongate, cylindrical. 

 Genotype. — Bostrichus aequalis Waterhouse. (Present designation.) 

 Lesne (1899) erected this genus for five species without designating 

 a genotype. 



The species of this genus are not very numerous, inhabiting the 

 warm parts of the Old World, but a .few of these species have been 

 carried in commerce to other parts of the world. 



KEY TO THE SPECIES OF HETEROBOSTRYCHUS 



Dorsal surface of body sparsely clothed with very short, recumbent, yellowish 

 hairs ; pronotum with median part on basal half granulose 



brunneus (Murray), p. 83. 



Dorsal surface of body glabrous; pronotum with median part on basal half 

 imbricate-punctate aequalis (Waterhouse), p. 85. 



Heterobostrychus brunneus (Murray) 



Bostrichus brunneus Murray, 1867, Ann. and Mag. Nat. Hist. (ser. 3) 20: 92-93. 

 Bostrychus brunneus Quedenfeldt, 1886, Berlin. Ent. Ztschr. 30 : 326-327 ; Lesne, 

 1896, Soc. Ent. de France Bui., p. 334. 



