186 FIRST ANNUAL REPOKT OF THE STATE ENTOMOLOGIST. 



Its Resemblance to A. radicum. 



Dr. Fitch {loc. cit. p. 497) declares his inability to separate A. hras- 

 sicce from A. radicum, the root-eating species, either by a comparison 

 of the larvae occurring in the roots of the cabbage, turnip and radish, 

 or by descriptions given by authors of the two species. The difference 

 in the color of the larvae indicated by Curtis — that of the former be- 

 ing yellowish-white and of the latter yellowish-olive — he regards as 

 unreliable, as he has found them pure white when first taken from 

 their burrows in the roots, and from exposure to the light they acquired 

 a yellow tinge, which became deeper as they were longer exposed. 



Description of the Larva, Puparium and the Fly. 



The best description of the insect given is that of Dr. Fitch, from 

 which we quote : " The larvas occur of different sizes at the same date, 

 the largest measuring 0.30 in length. They are footless and white, 

 composed of ten or eleven visible segments. On the throat or under- 

 side of the pointed end the jaws appear as a bifid black internal streak- 

 The hind end is bluntly cut off and flattened, with two elevated tawny 

 yellowish dots or spiracles on the disk, and around the margin is a row 

 of twelve conical fleshy points, the lower two larger and forked at their 

 tips, the next one on each side equally long but narrower and acute 

 pointed, and forward of these last is another transverse row of similar 

 points. [Kollar states that the truncated anal joint is surrounded by 

 ten fleshy points, of which the four lower are in pairs. According to 

 Curtis, it has two brown tubercles in the center, and several short teeth 

 on the lower margin.] 



The puparium is described in such general features as not to be ser- 

 viceable for separating it from the allied species. The pupation con- 

 tinues for about a fortnight when the perfect insect is given out, 

 " which is a two-winged fly, resembling the common house-fly, but, 

 somewhat smaller in size, measuring 0.30 in length to the end of its body, 

 and 0.36 to the tip of the closed wings. It is of an ash-gray coloi-, and 

 with three black stripes on the thorax or fore body, and on the hind 

 body a black stripe along the middle of the back, and a black band 

 upon each of the sutures. In the male the head is silvery-white, the 

 eyes coppery-red in the living specimen, and very large, nearly in con- 

 tact above — having between them a black stripe, which is much 

 broader at its commencement at the base of the antennae. The anten- 

 nae, feelers and legs are black. On the crown of the head, the legs, and 

 the hind body are black bristles, and on the fore body are coarser ones, 

 arranged in rows. The hind body is of a cylindric-conic form, its 

 under side with a black stripe in the middle and black bands on the 

 sutures, similar to the upper side. The wings are hyaline, ciliated 



