THE LAMELLICORN BEETLES. 



( J37 



176S (5591). Bolboceras iazarus Oliv.. Ent. Hist. Nat. ties Ins., 1, 17S9, 63. 



Broadly oval, robust, convex. Uniform chestnut-brown, shining; mar- 

 gins of head, thorax and legs fringed with long brownish-yellow hairs. 

 Males with a flattened, slightly recurved, truncate or emarginate horn on 

 clypeus and a transverse ridge on vertex; females with clypeal horn re- 

 duced to a ridge and vertical ridge higher than in male. Thorax of male 

 with a transverse ridge and a prominent tubercle each side on apical half: 

 these reduced in female to a blunt crest; median lengthwise groove wide 

 and deep behind the crest, with one or two coarsely punctured, obliquely 

 transverse grooves each side. Elytra with five coarsely punctured striae be- 

 tween the suture and humeral ridge and four or five additional ones on the 

 side. Length 6-12 mm. 



Throughout the State ; scarce. May 19-July 1. Two of the five 

 specimens in the collection were taken at electric light; the others 

 beneath rubbish 



XIII. Bolbocerosoma Scliseflcer. 1906. (Gr., "bull + horn + 



body.") 



In this genus the eyes are completely divided and the middle 

 coxae are very narrowly separated, with a tooth-like elevation aris- 

 ing from a process between them. One species is known from the 

 United States. 



1769 (5590). Bolbocerosoma farctum Fab., Spec. Insect.. I. 1781, 14. 



Broadly oval, very robust, strongly convex. Reddish-yellow : head, nar- 

 row basal line (and sometimes a discal spot) on thorax, sutural and mar- 

 ginal lines and apical third of elytra, black. Males with front edge of cly- 

 peus and angles in front of eyes, acute, elevated and slightly reflexed ; also 

 with a short, acute horn arising from the middle of the clypeus; females 

 with the horn reduced to a transverse ridge. Thorax of male with a deep 

 pit each side of apical half; between these a ridge with an acute tooth at 

 each end and a similar tooth outside each pit : in female the pits are absent, 

 the front half bearing only an elevated ridge. Elytra with five or seven 

 coarsely punctured stria? between the suture and numerals. Length 8- 

 12 mm. 



Throughout the State; scarce. June 6-June 15. Occurs be- 

 neath logs, most frequently in sandy localities-, also along path- 

 ways in woods. The black area of the upper surface varies greatly 

 in size. A female from Lawrence County has three black spots on 

 apical half of thorax, one median and a smaller one each side, and 

 the pale portion of elytra limited to a small rounded spot on basal 

 third. The specimens with seven stria? between the suture and 

 humeral prominence are usually listed as var. tumef actus Beanv. 

 All but one of the Indiana specimens are of this form. 



