116 INSECUTOR INSCITI^ MENSTRUUS 



knees, tips of tibiae and four proximal tarsal joints and cephalic 

 tibia and the distal half of cephalic femora. Neck of prono- 

 tum pale, the abdominal petiole dusky, somewhat longer than 

 wide, thus distinct but much shorter than the hind coxae. 

 Thorax polished, simple, the axillae subobsolete, very widely 

 separated, the parapsidal furrows faint, the propodeum with a 

 pair of separated median carinae, otherwise plane, the scutel- 

 lum plane or simple. Funicle 1 globular, not as large as the 

 pedicel, not half the length of 2, which is somewhat over twice 

 longer than wide, subequal to 3. Marginal fringes of fore wing 

 short. 



One female, Glenn Dale, Maryland, September 24, 1916. 



Type, Cat. No. 20608, U. S. Nat. Mus., the specimen on a 

 slide. 



A somewhat common species in meadows. 



Pachyneuron mucronatum, new species. 



Female. — Similar to the species in general but at once dis- 

 tinguished by having the meson of the otherwise concaved 

 clypeus armed with a distinct, acute tooth ; the marginal vein 

 is short, not twice longer than wide but only a half longer than 

 wide ; the scape is dusky except at base. Funicle 1 a little 

 wider than long, somewhat shorter than the pedicel. Abdomen 

 narrower than the thorax, its second segment longest, occupy- 

 ing a third of the surface. Propodeum without a median car- 

 ina, the spiracular sulcus distinct, the lateral carinae distinct, 

 originating at a basal fovea. Petiole very short. Mandibles 

 4-dentate. Tibiae blackish (except tips and most of cephalic 

 tibiae). Like the other species. Ring-joints equal. 



On€ female reared from an aphid, Guanajuato, Mexico 

 (T. D. A. Cockerell). 



Type, Cat. No. 20654, U. S. Nat. Mus., the female on a tag, 

 a head, a fore and hind leg and the wings on a slide. 



The shortened marginal vein, narrowed, more conical abdo- 

 men with the longer segment 2 and the toothed clypeus are 

 unique for North American species. 



