132 DIPTERA. 



male (the specimen is more abraded than the female) I perceive similar white patches, hut the fringes 

 along the margins seem to be less distinct. Venter clothed with whitish pile. Legs yellowish-brown, 

 the tarsi darker ; pulvilli distinct. Knob of the haltcres yellowish-white, brown at the base. The boundary 

 of the brown of the wings leaves hyaline — the tips of the axillary and anal cells, about two thirds of the 

 fourth posterior cell (within which it forms an angular sinus), cuts off the proximal end of the third 

 posterior cell, runs across the middle of the discal cell, strikes the small cross-vein, thence running along 

 the fourth vein, which it leaves a short distance before the end of the discal cell in order to strike a 

 perpendicular upon the second vein, follows the latter for a short distance, and then cuts across the marginal 

 cell, reaching the extreme end of the first vein ; the cross-veins within the brown have no pallid aureoles 

 (at least the pale colour around them is quite inconspicuous, and perceptible under the magnifying-glass 

 only) ; the usual subhyaline spot before the proximal end of the discal cell is present. 

 Length 12 millim. , 



Bab. Mexico, Northern Sonora (Morrison). 



I have a male and a female specimen. 



This is certainly not A. morioides, Say, Compl. Wr. ii. p. 58 (Missouri), because Say 

 distinctly describes the aureoles on the cross-veins, Nor can T recognize Hemipenthes 

 seminigra, Loew, Centur. viii. no. 44 (Saskatchewan), in the present species ; the 

 description of the abdomen and of the legs (" pedes nigri " &c.) does not agree, nor the 

 " cellula posterior prima anguste aperta ; " the first posterior cell of A. eumenes, although 

 coarctate after its expansion at the end of the discal cell, has a rather broad opening ; 

 Loew's species is smaller. 



Nevertheless, this is a true Hemipenthes in Loew's sense ; the pul villi are distinct ; 

 the boundary of the brown on the wings is very like that of the European A. morio 

 (comp. Meigen, ii. Tab. 17. f. 14), but the hyaline angle within the discal cell is 

 much deeper, and there is a little more hyaline at the end of the anal and axillary 

 cells. 



In my ' Western Diptera ' (p. 241) I have noticed the existence of several species in 

 the western regions which may be regarded as belonging to Hemipenthes. 



The wings of A. eumenes must be very like those of A. bigradata, Loew (which I do 

 not know) ; but I cannot identify the description of the abdomen of the latter. Besides, 

 Loew would not have overlooked the pulvilli. 



23. Anthrax scylla, sp. n., s . (Tab. III. fig. 1.) 



Head black, with black erect hairs, between which are shorter fulvous ones ; face very little protruding ; pro- 

 boscis withdrawn. Antennge brownish ; basal joints short ; third joint very short-conical, with a long styli- 

 form prolongation, and a microscopic bristle at the tip. Thorax brownish-black, with pale yellowish hair 

 forming a collar in front and an indistinct stripe on each side between the humerus and the scutellum. 

 Abdomen brownish-black, with a dense covering of erect hairs, these latter appear dark when seen from 

 above, except those on the distal third which (in some specimens more than in others) look 

 whitish; in a reflected light, however, from a side view, the whole hairy covering appears dull 

 whitish ; the sides are beset with a fringe of hairs, consisting of an uninterrupted row of tufts, 

 which are pale yellow at the base, then whitish on the anterior part of the second segment, 

 and black on the posterior part of the same and the other segments; this fringe is longer here 

 than in the allied species. Among the longer hairs on the thorax and abdomen there is a scattered 

 appressed tomentum of reddish copper-coloured hairs (they are easily rubbed off) Knob of the 

 halteres whitish at the tip. Legs more or less covered with fulvous scales ; ground-colour yellowish-brown, 



