412 BULLETIN 15, UNITED STATES NATIONAL MUSEUM. 



Aiiteniiie in S l-l-joiiited, tlie scape al)iioiinally enlarged, dilated, 

 with a deep emargi nation within; the tlagellum slightly iucrassated 

 toward apex, the Joints after the first niouiliform ; in 9 12 jointed, 

 clavate, the scape linear, the i)edicel longer than the first flagellar joint, 

 joints 2 to 5 snbeqnal, subglobnlar, the following forming the clnb. 



Mandibles bidentate. 



Thorax <»blong-(]nadrate, the prothorax not visible from above; 

 mesonotnm convex, withont fnrrows; metathorax very short, not 

 emarginated, the angles not acute, in $ sparsely, in 9 densely woollj-. 



Wings wanting in both sexes. 



Abdomen oval, truncate behind, the petiole very short, stout, woolly, 

 the second segment occupying nearly the whole surface. 



Legs short, stout, compressed, clavate, the tarsi short. 



This curious genus, known only in a single species, has not yet been 

 recognized in America, the species described as such by Abbe Provan- 

 clier under the nanu^ Phdymisclins torqiiatus (Add. a la Faune Hyni., 

 p. 182), being a Diai)riid belonging to the genus TropUlopria and allied 

 to Diapria conica Latr. and 1). carinata Thomson. 



The genus I'laiiimlsehus was originally characterized from the male; 

 and to the Eev. T. A. Marshall we arc indebted for perfecting the 

 generic diagnosis by the discovery of the female. Mi-. Marshall 

 believes the genus is i)arasitic on Dipterous larva' inhabiting low 

 marshes. 



LOXOTROPA Forster. 



Hyiu. Stud.. II, p. 122, 1856. 



(Type /,. ((cohitha FJlrst.) 



Head subglobose, often oblong, with a frontal sulcus, the occiput 

 rounded; checks woolly; eyes rounded; ocelli 3, minute. Antenna" 

 in 2 12-jointed, clavate; the three or four terminal joints most fre- 

 quently abruptly, enormously enlarged; pedicel usually much larger 

 than the first funiclar joint; in S li-jointed, filiform; scape subcla- 

 vate; pedicel short; first and second funiclar joints lengthened, the 

 first slightly the longer, the second thicker and usually curved, the 

 joints beyond oval or cup-shaped, seldom much longer than wide. 



^Mandibles short, bifid. 



Maxillary palpi, 5-jointed. 



Thorax ovoid ; prothorax slightly visible from above, usually covered 

 with a whitish wool, always present at sides; mesonotum smooth with- 

 out furrows; scutellum subconvex, or flat, smooth, truncate at ai)ex, 

 with distinct grooved lines along the sides, and a fovea at base; meta- 

 thorax short, emarginated. 



Front wings pubescent, the submarginal vein terminating in a small 

 stigmated marginal vein before attaining half the length of the wing; 

 basal vein always present. 



