470 C. R. OSTEX SACKEN'S PRODROME 



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

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

 basal cells ; the nnderside of the body, including chest and pleurae, is much darker, beset 

 with blackish and jellowish, bat no white hairs; on the femora also the pollen is more 

 3'ellowisli gray, less conspicuous, and the hairs on the front femora 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 subcallus denuded, black or brown, shining. In all other 

 respects, and in general appearance, these specimens look exactly like the typical T. illcitts. 

 It may be that this is a diflerent species. 



52. Tabanus microcephalus n. sji. 



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

 moderate breadth, hardly narrowed anteriorl}-, gray, mixed with brownish ; callositj' black 

 or brown, prolonged above in a rather stout black line ; vertex blackish ; the black hairs on 

 the front are short and inconspicuous. Palpi yellowish, stout at the base, taj^ering in a 

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

 hairs ; antenna) more or less dark reddish ; first joint often nearly black, with gra3ish 

 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 small, hardly excised above, thus having a lilunt 

 and but little projecting ujipor angle ; the annulate portion is stout, the joints composing it 

 very distinct. Thorax graA-ish black, with rather distinct graj- lines; pleura) gray. Abdo- 

 men rather large, in comparison to the size of the thorax, grayish black, with three 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, 

 restiniz: on the hind mararins of the sesrmcnts, and havinar their outer ends prolonged 

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

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

 open. Legs reddish brown, clothed with blackish and whitish hairs; tarsi darker ; femora 

 with gray pollen (sometimes they are dark brown). Length, 14-16 mm. 



Mule. I have three males before me, which, owing to the structure of their antenna^, 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 IG mm.) 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 mm.) the red is hardly perceptible, and the lateral gray 

 spots are more distinct. These specimens were taken in the ^Yhite jMountains, with a num- 

 ber of females, by Mr. Morrison. 



Ilah. White Mts., N. II. (Seudder and Morrison); 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 antennae, and the peculiar 



