244 MAINE AGRICULTURAL EXPERIMENT STATION. 1916. 



Puparium (Fig. 34-6). The dimensions of ten specimens were as 

 follows : The length ranged from 7.25 to 8 mm., with an average of 

 7.6 mm. ; the width 3.5 to 4 mm., the average 3.75 mm. ; the height 

 3.6 to 4 mm., the average 3.85 mm. The puparium bulbous in front, 

 a little broader than high. The ventral line usually quite concave ; 

 the dorsal line well elevated, attaining its greatest height about mid- 

 length. The greatest width about the anterior third, but diminishing 

 very little either in height or width until within about 2 mm. of the 

 posterior end; thence quite rapidly to the last segment which is com- 

 monly about one millimeter wide, half a millimeter high, and a milli- 

 meter long, uninflated. A prominent mid-dorsal carina, widening out 

 anteriorly extends forward from the posterior respiratory process. 

 The latter structure retains its larval characteristics. The color of the 

 puparium is grayish-brown, with a mid-dorsal, broken, blackish line 

 and an oblique lateral black stripe on the side of each segment due 

 to the integumental spines. The segmental spines are easily detected, 

 but remain inconspicuous because of their fineness and pale color. 



Adult (Fig. 34-7). I reproduce Vet-rail's description of this 

 species in full (55, p. 377), and append some brief notes on the 

 Maine specimens. 



"Eyes bare; abdomen ovate, with undulated entire yellow bands 

 which scarcely reach the side -mar gins; thorax shining; antennae con- 

 siderably luteous but darkened above; anterior tarsi mainly yellowish." 



"3. Resembling 6\ nitidicollis but quite distinct; it is broader and 

 flatter both on the thorax and abdomen. Face more blackish about 

 the mouth-edge, until in dark specimens the whole mouth-edge, the 

 jowls, and a middle facial line extending above the central knob are 

 black; on the other hand the black may be restricted in a very pale 

 specimen to a narrow mouth-edge and all the jowls; the pubescence 

 on the face is usually more black, and the pubescence behind the eyes is 

 deep orange instead of whitish as in S. nitidicollis. Fronts almost 

 always with blackish spots or lunules above the antennae, but otherwise 

 all yellow or orange, as is the face even up to the extreme top angle 

 instead of being, as in S. nitidicollis, blackish grey on the upper part. 

 Antennae much darker than in 5". nitidicollis, as they are at least 

 darkened above the third joint, and usually have the whole of the 

 upper part and end of third joint blackish or brownish as well as the 

 upper part of the second joint, or occasionally the antennae are alto- 

 gether brownish with only obscure orange spaces beneath the joints; 

 the third joint is distinctly longer than in S. nitidicollis, being on the 

 inside much longer than deep after the end of the second joint; 

 arista shorter and inserted farther from the base, with its basal joints 

 more distinct, and after the basal joints more luteous and with a 

 rather shorter thickened portion." 



"Thorax brightly shining blue-black with deep orange pubescence. 

 Scutellum with mostly black pubescence." 



