MOXOGKAI'H OF THE NORTH AMEUICAN rilOCTOTUYI'ID.E. 35 



Habitat. — riiited States. 



Tm'E: 9 ill llerliii Museum; i in Natumal Musemii aiidColi. Amer- 

 icau Kilt. Sue. 



The type of Sdcro^htmo nmtracta Westw. I liave seoii in tlie Berlin 

 Must'uiii; it lias .{-dentate and not 4 dentate niaudihh'S, as dt'sciibed by 

 Westwood. 



The species is widely distiilmted over tlu' United Stales, but the 9 

 is rare. Sperimeiis are in my (mllection I'lom Florid;' aiul Iowa, while 

 the National Museum ami the AiiK'ri«aii Entomoloj;i«al Soi-it'ty have 

 specimens from Texas, Georjjia, Virginia, Maryland, and other States. 



ISOBRACHIUM Forster. 

 •- llyiu. stud., II, p. !H) (1«5(!). 



(Type /. (ihnaluH) fuHcicorniH Xees.) 



Head in 5 much elongated, more rounded in i , the clu'eks ])o8teriorly 

 delicately margined; eyes in 9 wanting or very minute, in cJ rather 

 large, reaching to the base of the mandibles ; ocelli absent in 9 , i^reseut 

 in the $ . 



Antennse 13-jointed, tiliform, inserted in a clypeal fovea, the scape 

 curved. 



Maxillary palpi G-jointed; labial jialpi 4 jointed. 



Mandibles broadene ' and truncate at apex, in i with an acute outer 

 tooth and with usually 4 small blunt dentations within; in $ with 3 

 teeth, the outer two most freiinently eiiual. 



Thorax in $ similar to Epyrift, the prothorax rounde«l anteriorly, the 

 mesonotal furrows rarely complete, most frecpiently indicated only an- 

 teriorly, sometimes entirely wanting; there is also a distinct groove on 

 the shoulders; metathorax long; in the 9 the thorax between themeso- 

 and metathorax is strongly constricted and the scutellum is wanting. 



Front wings in i very similar to Epyris, only the stigma is smaller, 

 more quadrate, the transverse median nervure usually more oblique, 

 not so distinctly curved, while the discoidal nervure is present and the 

 second discoidal cell is more or less present; the 9 is always apterous. 



Abdomen ovate, depresse<l, the segments unequal; in 9 elongate, 

 conic ovate. 



Legs as in rrintocera, not much thickened in the <? ; tarsi longer 

 than their tibia*, the basal Joint of posterior tarsi as long as the re- 

 maining joints united; in the 9 the middle tibiie are spinous. 



This genus bears a superticial resemblance in the male sex to both 

 Mefsitins and Epyris, but the much slenderer legs, eyes extending to 

 base of mandibles, and the 4-jointed labial pali)i readily distinguish it 

 from those genera. The female comes nearest to rristoeera, but the 

 absence of a scutellum and the strongly constri<^ted metathorax suf- 

 ficiently separate it from it and other wingless forms. 



