468 C. R. OSTEN SACKEN'S PRODIIOME 



may serve as an excuse foi- my mentioning this species among those of the European fauna. 

 It is smaller than the other two, its coloring is a darker blackish gray, with an admixture of 

 brown. Face and front yellowish cinereous ; the former, as well as the cheeks, is beset 

 with black and pale yellowish hairs. Tlie palpi, of a dirty whitish, are beset with black 

 hairs, not only on the second, but also at the end of the first joint; a character especially 

 distinctive of this species. Antennae black, only the third joint, at the extreme basis some- 

 times dark reddish, the first in the shape of a cap (Kappenfoermig), and beset, as w^ell as 

 the second, with short black hairs ; the third joint is but little excised. Front of medium 

 breadth, with a square, shining black callosity, al)ove which is a shining black longitudinal 

 line, not quite connected with the callosity. Eyes strongly pubescent, with three cross- 

 bands, which have the same position as in T. quatuoDiotatus. With the soft, pale yellowish 

 pile on the thoracic dorsum, the pleurae and the coxte, many black hairs are mixed ; the 

 pollinose pale longitudinal lines on the thorax are but little apparent, the intermediate one 

 especially is almost obsolete. The lateral spots on the a]:)domen are more rounded than 

 in T. quatuornotahis , but in a simihir position ; the hind margins of the segments have a 

 delicate, rather whitish fringe of hairs ; the broad longitudinal stripe in the middle of the 

 blackish gray venter is usuallj' more distinct than in the related species, as the coloring of 

 the anterior segments beside it is often reddish ; when this is not the case, the stripe is 

 hardly more apparent than in the other species. Femora black, mostly with black hairs ; 

 the extreme tip of the femora and the tibioe yellowish brown, the latter more or less black- 

 ish at the end. Wings with a more distinct dusky tinge than in T. quatuornotahis and 

 nigricornis, the stigma dark brown, the first posterior cell a little more coarctate at the tip 

 than in those species." 

 Hab. Labrador. 



1. Among the numerous specimens belonging in the vicinity of the European T. qita- 

 iuornoiatus, I have a single one, likewise from Labrador (Caribou Island, Straits of Belle 

 Isle, A. S. Packard), which answers the above description with regard to the black hairs on 

 the cheeks and on the first joint of the jialpi ; only it is a little larger (between 14 and 

 15 mm.). 



2. Two other specimens from Labrador agree in all respects with the former ; they are 

 a little smaller, and have no black hairs on the cheeks, or on the first joint of the palpi. 



3. Two specimens from Yukon River, Alaska (R. Kennicott), agree in everything with 

 the specimen from Ijabrador, first mentioned, except that they have no black hairs on the 

 cheeks and on the first palpal joint. 



4. Seven specimens from Lake Winnipeg (Scudder), and five from some other localities 

 (Massachusetts ; Michipicoten, Lake Superior, Quebec, Canada), have the sides of the abdo- 

 men reddish on the first three or four segments, and the venter more or less reddish. They 

 are more slender than the specimens from Labrador and Yukon River, and the triangles in 

 the middle of the abdominal segments in most of them seem larger and more distinctly 

 marked ; the base of the third antennal joint is bright red in most of these specimens. 



5. Three specimens fi-om Maine (Mount Desert and the sea shore, B. P. Mann), and 

 one from Minnesota (Scudder) are smaller than the foi'mer lot (12.5 mm.), without any 

 reddish on the sides of the abdomen, and have the gray spots on the abdomen, both inter- 

 mediate and lateral, very distinct. 



