1883.] 37 



Habitat, Mexico (Berlin Museum, Xo. 3351). 



The structure o£ this species is in several respects so interesting, 

 that it merits a longer description than the rather brief diagnosis 

 given above. 



Body oblong, rather flattened and comparatively broad ; more or less covered 

 with close, short, adpressed pubescence. Black, somewhat shining, but this may 

 arise from the pubescence having been rubbed off in several places. Where the 

 pubescence remains it consists of, in some places, very short, adpressed, scale-like, 

 flattened, white hairs, and in others of less adpressed black hairs. The pronotum 

 and abdomen above have a bluish tinge, and the two pairs of posterior legs are 

 brownish-black. Between the eyes is a large, oval, orange-red spot, and on the 

 pronotum a narrow, rather indistinct, central longitudinal line of the same colour. 

 The front of the anterior acetabula, the front coxae, and a band on the inside of the 

 front trochanters, a long, narrow, triangular spot on the underside of the middle 

 acetabula, and a shorter triangle on the under-side of the hind acetabula, a small 

 spot on the under-side of the hind coxae, the middle of the hind-margin of the under- 

 side of the first genital segment, and a conspicuous spine-like process on the hind- 

 margin of the under-side of the second genital segment, are more or less ochraceous. 



Head, without the eyes, oblong, with the sides in front of the eyes sinuate ; the 

 vertex slightly concave in the middle, and the frons convex and sloping gradually 

 downwards. Hind-margin rounded. The eyes very large and prominent, situated 

 at the sides of the head, and extending a little behind it, and resting on the sides of 

 the pronotum ; the inner margin slightly sinuate. Antuuniferous tubercles situated 

 at the sides of the head, and near the front, and rather flatly, horizontally, expanded. 

 Antennae about half as long as the body, moderately stout, four-jointed, with a con- 

 spicuous jointlet between the 2nd and 3rd joint, and a smaller one between the 3rd 

 and 4th. First joint the longest, and slightly curved ; 2nd about one-third the 

 length of the 1st, somewhat thickened upwards ; 3rd about two-thirds the length 

 of the 2nd, and strongly incrassate upwards ; 4th longer than the 2nd, and much the 

 thickest joint, thickest in the middle, the apex curved upwards. Several of the 

 joints have erect spine-like hairs, but these are most numerous on the 4th. Rostrum 

 reaching to the front margin of the mesosternum, 4-jointed : 1st joint stout, short, 

 and subquadrate, 2nd ring-like, 3rd the longest, and 4th shorter and thinner than 

 the 3rd. 



Pronotum distinct from the mesonotum, much broader than long, longest in the 

 middle, narrower than the head with the eyes. Disc flat, with three rather obsolete, 

 shallow, but wide, longitudinal furrows. Front margin slightly concave, liind mar- 

 gin widely convex, sides rounded. Prosternum smaller than pronotum, disc slightly 

 convex, the outer third on each side occupied by the acetabula pf the front legs. 



Mesonotum forming nearly one-half of the total length of the body, oblong, 

 widening slightly backwards, wider in front than the pronotum ; disc flatly convex, 

 with, on each side, a wide longitudinal furrow, continuous with the lateral furrows 

 of the pronotum. Front margin widely concave, with the anterior angles prominent 

 and rounded, and extending a little forwards on each side of the pronotum. Sides 

 rounded. Hind-margin very distinctly bisinuate, the posterior angles extending con- 

 siderably backwards and downwards to form the acetabula of the middle legs. Meso- 



