328 THE CANADIAN ENTOMOLOGIST. 



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to form four small but distinct spots, occurring at tlie root of the second, 



the bases of the fork cells, and at junction of cross veins; first submarginal 



cell about one-third longer and a trifle narrower than second posterior, 



both stemsabout one-half the length of the latter ; cross-veins nearly of 



one length, and almost in a line; ventral scales long and slender; halteres, 



light stem, dark knobs, 



Male. — Much as female ; antennae give banded appearance; verticels 



light l)rown ; i)alpi as long or longer than proboscis, dark brown, with a 



light band at base of apical joint, plumes brown except at the light band, 

 where ihey are yellowish ; very marked contraction at the distal end of 

 the second abdominal segment, giving a " wasp waist " effect ; legs as in 

 female, but the bands distinct and fairly wide, especially on the hind legs, 

 where there is a narrow band on the third tarsal ; in the fore and mid legs 

 this joint has only a suggestion of a band ; fourth joint brown ; ungues 

 large, unequal in fore and mid legs, the larger biserrate and the smaller 

 uniserrate, in hind legs large, simple and equal. 



Length, lo-ii mm. Habitat, Fort Egbert, Alaska. Taken May- 

 June. 



Type, No. 9959, U. S. N. M. 



Described from five females and one male sent me by ist Lieut. J. R. 

 Bosley, Asst. Surg. U. S. Army, in two collections from Fort Egbert, 

 Alaska. 



It is closely related to both animlata, Shrank, Fa/bici, No., and 



penetrans, Desvoidy. Differs from the former in that it has only the tiny 



spot on the thorax ; there is no band on the female palpus, and only one 



on the male ; there is no ring on the femur, and the leg bands are much 



narrower qnd ochraceous rather than white. 



It differs from Fa/bici also in the thoracic marking; the palpi are only 

 white scaled; the median stripe on the second abdominal segment; the 

 tarsal bands are basal only, and the mid ungues of the male have only one 

 tooth on the smaller. It apparently reverses the colouring of penetrans^ 

 and has only four " maculis plus minusve distinctis." 



It is possibly not out of place to state here that the specimens from 

 San Francisco, Cal., which otherwise agree well with Theobald's descrip- 

 tion of T. aiinulata, Shrank, lack the mid band on the metatarsi, and that 

 three, and sometimes even four, tarsal joints are minutely banded. 



