314 p. CAMERON. 



Comes near to N. fuscipes Cresson, from Texas. The form of the 

 last segment is different. In tlie present species the incision is dis- 

 tinctly wider than h)ng ; the teeth being not mucli longer tliau their 

 width at the base. In fuscipes the incision is distinctly longer than 

 wide, and the teeth are long and narrow ; the lateral teeth, too, are 

 sharper and narrower and extend beyond the base of the incision, 

 which is not the case with the present species. The bands on the 

 apices of the segments have a distinct golden color. The 7th ab- 

 dominal segment ( <J ) of N^ fuscipes is figured by Handlirsch Sitzb. 

 der Kais. Akad. der Wissensch., 1887, pi. iv, p. 23. 



AlyMoii flavomaviilatiis sp. nov. 



Black, the clypeus, two marks on tlie apex of the pronotum, a line on its hinder 

 edge, an interrupted line near the base of the scutellum, two small marks near 

 the middle of the basal segment of the abdomen, and a broad, irregular band on 

 the base of the 2nd segment, bright yellow ; the wings hyaline, the nervures and 

 stigma black. %. Long: 7 mm. 



Antennse stout, black, the scape broadly yellow below; the flagellum covered 

 with a short black pile. Head black ; the lower two-thirds of the inner orbits — 

 the band, broad below, narrowed above — the clypeus and the mandibles, except 

 at the apex, yellow; the front, face and clypeus densely covered with silvery pu- 

 bescence; the front minutely and closely punctured. Mesonotum closely and 

 minutely punctured and covered with a short down, as is also the scutellum. 

 The post-scutellum is thickly (covered with fuscous pubescence. In the centre of 

 the median area is a large, somewhat triangular area, which reaches close to the 

 top of the apical slope, in its centre are two stout keels which diverge slightly 

 towards the apex; the sides are marked with short keels, which nnite to the 

 bounding keels; on the outer side of these are some irregular longer keels, there 

 being also a few on the innerside of the lateral keels. The whole segment, and 

 more particularly the apical slope, is covered thickly with white pubescence; the 

 mesopleuraj are less thickly covered with similar pubescence. Legs black ; the 

 knees, the whole of the anterior tibiae and the base of the middle tibiaj in front, 

 testaceous; the whole of the legs are covered with a wliite pile. Wings clear 

 hyaline, the nervures and stigma black ; the first transverse cubital nervure is 

 broadly rounded ; the 2nd is straight and oblique; the third is roundly curved 

 outwardly from near the top. Abdomen smooth and shining; the 2nd and fol- 

 lowing segments are covered thickly with a pale pubescence; there are two small 

 yellow marks shortly beyond the middle of the first segn)ent; the 2nd segment 

 is broadly banded with yellow at the base, the yellow band being narrowed in 

 the middle; the apices of the other segments are brownish at the apex ; the last 

 is punctured and is transver.se at the apex. 



Hub. — Santa, Fe Mountains, New Mexico. 



As this species is not a typical Alyson, nor of the allied genus or 

 subgenus Didineis, I give below a generic description of it. It has 

 the neuration of Alyson rather than of Didineis, except that the 



