174 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



ACOLUS Fiirstei. 



Jlyiii. Stiul.. II, jiji. KK) and 102 (isr^i). 



(Typ«; J. jti(riri'n1>-is FJirst. MS.) 



Eesul largt", traiisver.se, the lioius very convex, the faee with an im- 

 pression just above the antenna', tlu^ occiput concave, einarjjinated, and 

 faintly niarjjfined; ocelli 3, very minute, the lateral close to the margin 

 of the eye, hut scarcely discernible; eyes larjre, oval, bare, or hairy. 



Antenna' inserted just above the clyjH'us, in 9 T-joiiited, clavate, the 

 club large, inarticulated, the pedicel stout, the lirst fiinielar joint a lit- 

 tle longer than thick, the three following joints small; in 6 12-joiuted, 

 tiliform, pilose. 



Maxillary palpi .'5-jointed; labial palpi (?) li- jointed. 



Mandibles bifid. 



^^' rax subovoid, not wider than long, and narrower than the hea<l; 

 pronotum not visible from above; mesonotum traiisvei'se without fur- 

 rows; scutelluui semicircular; metathorax extremely short, abrupt. 



Wings in 9 wanting; in c^ i)resent, the front wings with a basal nerv- 

 nre, a short marginal ami short stigmal nervure; the latter clavate. 



Abdomen broadly oval, sessile, the first segment the wi<lth of the 

 metathorax and only visible as a transverse line, the second about one- 

 third the length of the third, which is the largest, the following seg- 

 ments short. 



Legs as in AViv/x, the basal joint of hind tarsi one-tiiird longer than 

 the second, the tibial spurs weak. 



Differs from Acoloidex Howard, in the concave einarginat«!<l occiput, 

 in the deep facial impression, bare eyes, .'i jointed maxillary palpi, and 

 in the broadly oval sessile abdomen, the base being as wide as the 

 metathorax, the first segment visible only as a transverse line. 



AcoluB xanthogaster, s]i. iiov. 



9 . Length, 0.75""". Mead and thorax black, shining, faintly micro- 

 scopically [nmctate; antenna', abdomen, and legs, yellow. Head a lit- 

 tle more than twice as wide as thick antero posteriorly, the frons con- 

 vex, the face with an antennal impression, the eyes large, rounde«l, 

 bare. Anteniue with an unjointed club; the pedicel longer than the 

 first funiclar joint; first and second funidar joints about e(pial, longer 

 than thick; third and fourth, minute. Abdomen oval, sessile, the first 

 F«'gment only visible as a transverse line, the second about two-thirds 

 the length of the thiid. 



Habitat. — District of Columbia. 



Type in Coll. Ashmead. 



D«'scribed from a single siM'cim«^n collected by Mr. E. A, Hchwar/, 

 .luneL>0, ISIU. 



