368 Annals Entomological Society of America [Vol-Wis 
LARVA. 
‘“Measurements, when full grown: Length, exclusive of caudal 
hairs, 5.4 mm.; inclusive of caudal hairs, 8 mm.; breadth, 1.6 mm. 
Upper dermal surface reddish brown; lower surface vitreous white; 
entire surface covered with short, soft, yellowish brown hairs; each 
stigmatic orifice surrounded by a stellate tuft of longer setose hairs, of 
variable length and of the same color as the general hairy covering. 
The upper surface of the last three segments is entirely concealed by a 
dense mass of short, erect dark brown hairs so nearly equal in length as 
to present the appearance of having been cut off with shears, like the 
bristles of a very compact brush. The sides of the upper surface of the 
two preceding segments have a similar covering. The two caudal 
appendages, which attain one-half the length of the body are notice- 
ably separated when the larva is in motion, often appear to the eye to 
consist each of a single, stout, elongated bristle, but, under the micro- 
scope, are seen to be composed in each case of from twenty to 
twenty-five hairs. 
PUPA. 
‘Length, 4 mm.; breadth, 2 mm. 
“Enclosed within the larval skin, and visible only from above, 
where the larval skin is longitudinally split open along the median 
dorsal line from head to anal segment. Abruptly narrows to a point at 
the anal extremity. Removed from larval skin, the entire surface of 
the pupa is seen to be covered with short, soft, light yellowish brown 
hairs, except at the center of dorsal surface which contains three 
minute transverse incisions or furrows. The anterior margin of each 
furrow is straight while the posterior margin is curved. Examined 
under the microscope, both margins of each incision are seen to be 
minutely dentate, but the teeth of the posterior margins are more 
prominent than those of the anterior margins.”’ 
Dr. Snow has apparently obtained and measured larve of . 
the average size, for the larve attain a much larger size than 
5.4 mm. We have collected and raised a large number of 
specimens which have attained the size of 7 mm., and not 
infrequently do we obtain larve as long as 8 mm., exclusive of 
the caudal hairs, and 10 mm. including the caudal hairs. The 
breadth of such specimens is 2.6 mm. Very frequently in the 
full grown larve the upper surface of the last five segments is 
entirely concealed by the dense mass of hairs and the sides of 
the upper surface of as many as four of the preceding segments. 
have a similar covering. 
The life history of T. tarsale has never been worked out, 
and a few scattered notes, most of which are subsequently 
quoted in this paper, comprise the literature on this well known 
museum pest. 
