174 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



ACOLUS Forster. 



Hyiu. Stud.. II. ])]>. 100 ;iii(l 102 (1S.5H). 

 {Tyyte J. })i<firriiiri>i Fiirst. MS.) 



Head large, transverse, the Irons very convex, tlie face with an im- 

 pression jnst above the antenna', the occiput concave, eniarginated, and 

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

 of the eye, but scarcely discernible; eyes large, oval, bare, or hairy. 



Antenna' inserted Just above the clypeus, in 9 7-Jointed, clavate, the 

 club large, inarticulated, the pedicel stout, the first funiclar joint a lit- 

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

 filiform, jiilose. 



Maxillary palpi .{-jointed; labial palpi (?) 2-joiuted. 



Mandibles bifid. 



Thorax subovoid, not wider than long, and nairower than the head; 

 pronotum not visible from above; mesonotum transverse without fur- 

 rows; scutellum semicircular; metathorax extremely short, abrupt. 



Wings in 9 wanting; in S present, the front Avings with a basal uerv- 

 ure, a short marginal and short stigmal nervure; the latter clavate. 



Abdomen broadly oval, sessile, the tirst segment the width of the 

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

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

 ments short. 



Legs as in Jians^ the basal joint of liiiid tarsi one-tliird longer than 

 the second, the tibial spurs Aveak. 



Differs from Acoloides Howard, in the concave emarginated occiput, 

 in the deep facial imiu'ession, bare eyes, 3 jointed maxillary palpi, and 

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

 metathorax, the tirst segment-visible only as a transverse line. 



Aeolus xauthogaster, s]». nov. 



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

 scopically punctate; antenuie, 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, rouii<led, 

 bare. Antenna' with an nnjointed club; the pedicel longer than the 

 first funiclar joint; first and second funiclar joints about equal, h)Uger 

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

 segment only visible as a transverse line, the second about two-thirds 

 the length of the third. 



Habitat. — District of Columbia. 



Type in Coll. Ashmead. 



Described I'rom a single s])ccinien collected by ]Mr. E. A. iSchwarz, 

 June2<>, isid. 



