NORTH AMERICAN BOSTRICHIDAE 67 



pt. 10, pp. 803, 805 ; Lesne, 1924. Bostrychides de l'Afrique Tropicale Frangaise, 

 pp. 114, 131-133: Gardner, 1933, Indian Forest Rec, Ent. Ser. 18 (9) : 13-14, 



pi. 4, figs. 43-44. 



Head slightly convex on vertex, flattened or transversely concave 

 behind eyes, deeply inserted in prothorax. not visible from above: 

 clypeus long, strongly transverse, flattened, broadly, shallowly, arcu- 

 ately emarginate in front, anterior angles acute ; clypeal suture obso- 

 lete'or distinct at middle; labrum short, strongly transverse, sub- 

 truncate and densely ciliate with long, yellow 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 projecting. Antenna short, 9- or 10-segmented : first and 

 second segments robust, elongate, second shorter than first; third to 

 sixth or seventh segments short, round or transverse, sometimes nar- 

 rower than second, subequal in length to one another : last three seg- 

 ments forming a broad, loose, compressed club, each segment with two 

 or three long, sensory depressions on each surface, the first and second 

 segments of club usually subequal in length to each other, round, 

 subquadrate or subtriangular. apical segment oblong or oval. Rarely 

 with a 2-segmented club. Pronotum strongly convex, truncate at 

 base, truncate, rounded, or emarginate in front, dentate anteriorly, not 

 transversely depressed behind anterior margin : sides not margined : 

 posterior angles rounded. Scutellum small, quadrate. Elytra 

 strongly convex, abruptly declivous posteriorly, with or without tuber- 

 cles on apical declivity. Legs short, subequal in length: tibiae ex- 

 panded toward apices, usually dentate on exterior margins, anterior 

 pair with a large, arcuate spine at apices: posterior tarsi as long as. or 

 longer than tibiae, apical segment of each shorter than preceding four 

 segments united. Anterior coxae contiguous. Middle coxae nar- 

 rowly separated. Posterior coxal cavities completely margined on 

 first visible and abdominal sternite. Intercoxal process of abdomen 

 tabular or narrowly triangular. Body elongate, cylindrical. 



Genotype. — Of Amphicerus. Apate bicaudatus Say. (Present 

 designation.) Of Caenophrada* Caenophrada anobioides TTater- 

 house. (Monobasic.) Of Srhistoceros. Bostrichus bhnoctdatus 

 Olivier. (Present designation.) 



LeConte (1861) erected AmpJdeerus for Apate bicaudatus Say. 

 Apate aspericoUis Germar. and Bostrichus punctipennh LeConte. 

 without designating a genotype. 



TTaterhouse (1888) erected the genus Caenophrada for his new 

 species anobioides from North India, but Lesne (1938) placed it as 

 a svnonym of Amphicerus. 



Lesne (1899) erected Schistoceros for 11 species without designat- 

 ing a genotype. Lesne stated that Amphice'ms LeConte was pre- 

 occupied hj Amphicerus Gray (1847) in the mollusks and suppressed 

 it under his new genus Schistoceros. In 1937. however, he reversed 

 his decision, but divided the genus into two subgenera, conserving the 

 name Amphicerus for the species in which both sexes have the horns 

 of the prothorax. and Schistoceros for those in which the females or 

 both sexes have the prothorax rounded and unarmed at the anterior 

 margin. 



The species of this srenus are distributed throughout North. Central, 

 and South America, Mexico. TVest Indies, Hawaii, Indo-China, India. 

 Malaysia, Arabia, and the Mediterranean Region. 



