252 MAINE AGRICULTURAL EXPERIMENT STATION. 1916. 



The anterior end bears, in addition to the characteristics remaining 

 from the larval stage, a pair of pupal respiratory cornua situated well 

 dorsad, their bases about .75 mm. apart (Fig. 36-8A, 10A). Each 

 cornuum strikingly like a common species of morel mushroom in 

 appearance; about .4 mm. broad and .5 mm. long, the basal third or 

 fourth slenderer. Its surface bears a hundred or more of minute 

 papillae each when very highly magnified (Fig. 36-p) showing a further 

 ornamentation of its surface with five to eight nodules. 



The buccal hood of the larva occupies, a position at the anterior 

 extremity of the ventral line (Fig. 36- 10C), and although they art 

 much less conspicuous, the arrangement of thorns and hooklets remains 

 essentially as in the larval stage. For the emergence of the adult the 

 anterior end splits into a two-piece operculum; one transversely elon- 

 gate piece surrounding the pupal respiratory cornua ; the other an 

 ovate piece, cephalad of this and including the anterior larval spiracles, 

 but not the two pairs of largest hooks. The posterior end of the 

 puparium much as in the larva; the respiratory process terminal and, 

 at each side of it, the three pairs of lateral processes of the body-wall, 

 somewhat shrunken and indurated. Slight traces of the transverse 

 wrinkling remain and on careful examination the larger hooklets of 

 the prolegs can be distinguished. 



The duration in the pupa stage was between 9 and 15 days, 

 this stage being noted during late July and early August. The 

 pupa? were found a few inches under the surface in the mod- 

 erately-dry parts of the excrement in which the larvae had fed. 

 Pupation is accompanied by the induration of the larval skin 

 with chitin and the great inflation especially of larval segments 

 five to eleven. 



Adult (Fig. 36-12, 13, 14). Eyes bare, face with a median keel-like 

 ridge, marginal cell open, third vein curved, anterior cross-vein beyond 

 the middle of the discal cell; hind femora extraordinarily thickened with 

 an angular projection below near outer end; abdomen of nearly equal 

 width. 



Length 9 to 12 mm. Front in .female narrow above ; face gently 

 convex in profile in the male, a little concave near the middle in the 

 female ; densely covered with yellowish gray pollen, leaving a slender 

 median stripe and a spot on the cheeks black. Antennas yellow, third 

 joint nearly square. Dorsum of thorax shining, greenish black, with 

 two rather distinct median pollinose stripes in front, two spots of the 

 same colored pollen in front of the scutellum, another in front of each 

 postalar callus, on the humeri, and a spot along the dorso-pleufal 

 suture immediately behind the humeri. Scutellum yellow along the 

 border. First abdominal segment black, yellow on the sides ; second 

 segment in front (but not reaching the sides) and a narrow median 

 stripe black, behind extending narrowly to the sides, more brownish, 

 forming an inverted T; third segment with a similar T but more 

 brownish, less distinct. In the female the black on the second segment 



