1 894.] ENTOMOLOGICAL NEWS. 295 



black hairs is different, whereas in S. sumichrasti there extends backwards 

 from the prothorax a large triangle, the sides of which are each longer 

 than the base, and the apex of which is truncate; there is in diigesii a 

 smaller black triangle, the base of which occupies the whole front of the 

 thorax, and is broader than either side. The apex of this triangle joins 

 the apex of another black triangle, the base of which is the breadth of 

 the metathorax. These two black triangles together form an hour-glass 

 shaped mark. The yellow pubescence to the sides of thorax forms two 

 triangles, the sides of which are adjacent to the black triangles; these 

 triangles do not, of course, meet in the middle line. Legs castaneous, 

 spines and ends of middle and posterior femora black. Abdomen elon- 

 gate, pyriform; first segment broad, but somewhat constricted at apex, 

 bearing on each side a small, stout spine; second segment clothed above 

 w^ith scarlet hairs, but having its base and apex fringed with pale ochra- 

 ceous hairs, except that at the base dorsally is a large, squarish black 

 patch, interrupting the pale fringe and extending somewhat into the red. 

 This patch shows a slight tendency to be trilobed, as in heterochroa. 

 Remaining segments of abdomen, except last, fringed with pale ochra- 

 ceous hairs, except a large black triangle on dorsum, having for its base 

 the margin of the second segment. Last segment black. 



Hab. Guanajuato, Mexico (Dr. A. Duges). One specimen. 



Brachycistus elegantulus n. sp. $ 6-7 mm. long. Head black, sparsely 

 hairy, mandibles rufous; antennae dark honey-color, sutures darkened, 

 first joint of flagellum about as long as second; antennae very long; palpi 

 pale yellow; eyes large and prominent, ocelli prominent. Thorax some- 

 what narrower than head, honey-color, moderately dark; metathorax 

 rounded and gradually descending, not reticulate. Legs honey-color, 

 somewhat lighter than thorax, slightly hairy. Abdomen slender, shiny, 

 sparsely hairy; first segment dark honey-color, rest of abdomen deep 

 fuscous; first segment elongate, hardly constricted at apex. Wings hya- 

 line, nervures pale fuscous; stigma very large, dark brown. Marginal 

 cell very small and short, very narrow, and almost wholly beneath stigma, 

 terminally appendiculate. First submarginal cell large, about as long as 

 stigma, extending beyond second submarginal; second submarginal very 

 small, elongate, subtriangular, receiving first recurrent nervure at base or 

 (in some specimens) a little beyond. Third submarginal subquadrate, 

 tending to subtriangular, receiving the second recurrent nervure before 

 the middle. 



This little species was taken in numbers by Prof. E. O. Wooton 

 and the present writer on the Mesa east of the New Mexico Ag- 

 ricultural College on the occasion of a meeting of the College 

 Field Club on the evening of Sept. 22, 1894. They were at- 

 tracted by means of lights, being, like others of the genus, 

 strictly nocturnal. 



