248 MAINE AGRICULTURAL EXPERIMENT STATION. 1916. 



istic of the larva. It rounds out anteriorly and dorsally, the point 

 midway between the fourth and fifth segments coming to lie at the 

 anterior pole, the mouth being shunted backward on the ventral side. 

 The pupa is concealed in this indurated, inflated, sub-ovate, larval skin 

 or puparium. 



Puparium (Fig. 35-6, 7). Length 9.5 to 10 mm., width 4.5 to 5 mm., 

 height about 4.5 mm. Color, Roman sepia, a little darker than the 

 larva. Broadest a little back of the sixth larval segment, nicely rounded 

 in front, tapering gradually to the last segment which remains some- 

 what flattened, especially at the sides. The covering of small black 

 bristles is retained and the black conical prominences become even 

 more conspicuous owing to the inflation (Fig. 35-6, 7). The posterior 

 breathing appendages retain the larval condition. 



Adult (Fig. 35-1). Description slightly modified from Williston 

 (62, p. 89). $ c? Length 11-15 mm. Face yellow, with a small elongate 

 brownish spot on the tubercle. Front yellow, with two brownish spots 

 above the antennae, or, in the female, with an inverted V-shaped brown 

 stripe connected with the black of the upper part of the front. Eyes 

 bare. Orbits thickly yellowish pollinose, posteriorly with a fringe of 

 yellowish-whitish pile. Antennae black, the third joint at the base some- 

 times reddish, elongate oval, obtusely pointed at the tip ; arista reddish. 

 Thorax shining greenish black, on the meso-, ptero-, and sterno-pleurae 

 yellow, thickly covered with similar colored pollen and pile. Scutellum 

 light yellow, translucent. Wings grayish hyaline, the base before the 

 humeral cross-vein and the stigma brown; the remainder of the sub- 

 costal cell and the costal cell may be brownish ; third vein rather 

 deeply curved near the middle of the first posterior cell. Legs brown, 

 the posterior tibiae and all the tarsi blackish ; sometimes the legs are 

 luteous, the base of femora, distal portion of tibiae, and the tarsi brown. 

 Abdomen black, with four yellow cross bands, the first consisting of 

 two large ovate spots, narrowly separated and reaching the lateral mar- 

 gins in nearly their full width ; second and third cross-bands broad 

 separated from the lateral margins by a black narrow keeled border; 

 they are much narrower in the middle of the segments, the front 

 margin straight, touching the anterior edge of the segments ; fourth 

 band similar, but much smaller and attaining the margin ; all the black 

 is velvety opaque except the narr'ow posterior margin of the segments 

 which is shining, dilated in the middle. 



Tropidia quadrata Say. 



This common, widely distributed species has been well known 

 for many years, but no record has been made of the larval 

 habits of this or any other species of the genus. No record 

 had been made of its immature stages previous to the descrip- 

 tion by Mr. J. R. Malloch in December, 1915 (28, p. 343), of 



