470 C. R. OSTEN SACKEN'S PRODROME 



appear darker ; in one of the specimens (Quel)ec) there are black hairs, even on the first 

 joint; the wings have a more distinct brownish tinge, especially the costal and the two 

 basal cells ; the underside of the body, including chest and pleurte, is much darker, beset 

 with blackish and yellowish, but no white hairs; on the femora also the pollen is more 

 yellowish gray, less conspicuous, and the hairs on the front femoi'a are black, on the hind 

 ones yellowish ; the gray spots on the third and the following segments seem to be larger. 

 All these specimens have the snbcallus denuded, black or brown, shining. In all other 

 respects, and in general appearance, these specimens look exacth' like the t3pical T. lUotns. 

 It may be that this is a different species. 



52. Tabanus microceplialus n. sp. 



Female. Head small, in comparison to the bulk of the body; eyes pubescent; front of 

 moderate breadth, hardly narrowed anteriorly, gray, mixed with brownish ; callosity black 

 or brown, prolonged al)Ove in a rather stout black line ; vertex blackish ; the jjlack hairs on 

 the front are short and inconspicuous. Palpi yellowish, stout at the base, tapering in a 

 rather elongated point, clothed with short black hairs ; face grayish white, with white 

 hairs ; antennoa more or less dark reddish ; first joint often nearly black, with giayish 

 pollen above, the third black towards the tip ; the shape of the third joint is peculiar: it 

 is narrow, the body of the joint is rather smrdl. hardly excised above, thus haviiig a blunt 

 and l)ut little projecting upper angle ; the annulate portion is stout, the joints composing it 

 very distinct. Thorax gi-ayish black, Avith rather distinct gray lines; pleurio gray. Abdo- 

 men rather large, in comparison to the size of the thorax, grayish black, with thi-ee distinct 

 rows of gray spots ; the spots of the intermediate series are triangular, the largest and 

 most distinct on the second and third segments, where their apex often has a linear prolon- 

 gation reaching the anterior margin of the segment ; the lateral spots are oblique triangles, 

 resting on the liind margins of the segments, and having their outer ends prolonged 

 towards the lateral margin. Venter grayish, the reddish ground color being often visible 

 under the gray pollen. Wings suljhyaline ; stigma dark brown ; first posterior cell broadly 

 open. L?gs reddish Ijrown, clothed with blackish and whitish hairs; tarsi darker; femora 

 with gray pollen (sometimes they are dark brown). Length, 14-10 mm. 



3J(ile. I have three males betbre me, which, owing to the structure of their antcnncT, I 

 refer to this species. They do not materially differ from the female, except that the head 

 is comparatively larger; the hairs on cheeks and palpi are black ; the abdominal markings 

 less distinct. The largest of the three specimens (nearly 16 unii.) has the sides of the 

 abdomen red on segments one to four ; owing to this ground color the lateral gray spots 

 are l)ut little apparent. In the second specimen, which is a little smaller, there is less red 

 on the sides ; in the third (about 12 nnn.) the red is hardly perceptible, and the lateral gray 

 spots are more distinct. These specimens were taken in the White Mountains, with a num- 

 ber of females, Ijy Mr. Morrison. 



Ilah. White Mts., N. 11. (Scudder and Morri.son) ; Trenton Falls, N. Y. (in July, 1874, 

 by myself) ; Massachusetts (Sanborn). I have twelve females and three males before me. 



The eyes of this species have four green stripes, the two inner ones especially brilliant 

 bluish green ; intermediate spaces purple. The shape of the antenna^, and the peculiar 



