20 BULLETIN: MUSEUM or COMPARATIVE ZOOLOGY. 



BUETHOBIUS OABITUS Chamberlin. 

 Ann. Ent. soc. America, 1911, 4, p. 34. 



DIAGNOSIS. Dorsum, with antennae and legs, yellow; head and 

 posterior plates of dorsum orange. Slender, being 8f or more times 

 as long as width of tenth plate; sides nearly parallel cephalad of tenth 

 plate. Head broadly subcordate; wider than long. Antennae long, 

 being more than half the length of the body; articles 36. Prosternum 

 a little less than twice as wide as long; teeth small and pale, 3+3. 

 Posterior angles of none of the dorsal plates produced. Legs long, 

 the ultimate pair especially so, slender and without special lobes in 

 the male; claw of anal and of penult legs single. Coxal pores small, 

 circular. Claw of female gonopods long and slender; strongly curved; 

 basal spines acutely conical, with the slender distal portion black. 

 Gonopods of male long, attenuated distad ; distal article bearing ,an 

 acutely pointed spine. Length 10-12 mm. 



DESCRIPTION. Color in general yellow or light yellowish brown. 

 The head, prosternum, and prehensorial feet, and, usually the more 

 caudal segments both above and beneath, clear orange. Antennae 

 and legs clear yellow. 



Slender, the length being 8f or more times as great as the width of 

 the tenth dorsal plate. Nearly parallel sided for most of the length, 

 being but little narrowed cephalad of the tenth plate, but more de- 

 cidedly caudad as usual. Body in general sparsely hirsute; the dorsal 

 plates with stouter bristles along the lateral margins and the minor 

 ones with a transverse series near caudal margin; legs more densely 

 clothed with finer hairs among coarser spinescent bristles which are 

 few on tarsi, where they occur chiefly at the indicated juncture of first 

 and second joints but more numerous on tibia and more proximal 

 joints. 



Head broadly subcordate; wider than long in about ratio 11:10; 

 conspicuously narrowed in front of middle, caudad of which the sides 

 but slightly converge; the caudolateral corners well rounded. (Plate 

 3, fig. 7). 



Prosternum not much less than twice as wide as greatest length 

 (32:17); not much produced cephalad, the anterior margin being 

 very wide, widely angularly and but shallowly incised at middle. 

 Teeth small, pale, 3+3, subequal; the innermost on each side well 

 removed from the middle line; the middle tooth on each side farther 

 from the outermost than from the innermost. (Plate 3, fig. 1). 



