234 MAINE: AGRICUI/TURAI, EXPERIMENT STATION. 1916. 



of thorax dark greenish olivaceous with a yellow lateral stripe, indis- 

 tinct or wanting back of the suture. Pleurae with light yellow spots as 

 shown in Figure 31-71. Scutellum sulphur yellow. Abdomen slender, 

 second segment with a broad yellow cross-band in the middle, and a 

 brown or black band in front and behind, not reaching the lateral 

 margin. Remaining abdominal segments variable, third with a broader 

 yellow band and more narrowly brown or blackish in front and behind. 

 Hypopygium wholly reddish-yellow, globose, with a tuft of pile below 

 in front. Legs yellow including the coxae. 



$. Front shining black, yellow on the sides below ; yellow lateral 

 stripes of thorax extending only to the suture. Abdomen moderately 

 broad, shining black, with the extreme lateral margins continuously 

 yellow and a moderately arcuate, entire, yellow band, reaching the 

 yellow on the sides, on each of the segments from two to four inclusive. 

 These bands cover about one-third the length of the segment. Fifth 

 segimnt with a similar but slenderer yellow band interrupted in the 

 :niddle. Sixth segment yellow with some black on the disk. In other 

 respects as in the male. 



ALLOGRAPTA OBLIQUA Say. 



(See also 33, p. 533 and 35, p. 58.) 



This species which ranges throughout much of this country 

 and is often common, was very rare about Orono during 1915, 

 being represented in the collections by a single male taken 

 about blossoming cabbage, July 29. The immature stages were 

 not encountered. However, on account of its close resemblance 

 to Sphaerophoria cylindrica and Melanostoma mellinum, and 

 the certainty that it does occur here, the following brief descrip- 

 tions are included from the author's Ohio report (33). 



Egg. (Fig 31-67, 62, 63). Elongate oval in outline, narrowing to 

 the roundly-pointed anterior end and the truncate micropylar end. 

 Length about .8 mm., diameter about .3 mm. Color chalk white, with 

 the usual microscopic sculpturing (Fig. 31-63}. The main bodies of the 

 elevations are broader than in Syrphus americanus, three or four times 

 as long as broad; sub-oval, the arms thicker and shorter than in 5. 

 americanus, usually about fifteen around each body. The depressed 

 space between the bodies about .two-thirds as wide as the body. About 

 28 of these elevated bodies the length of the egg; about 55 around it at 

 the middle. 



Larva. (Fig. 31-65, 66, 67, 68). When just hatched (Fig. 31-65) the 

 larvae have a length of 1.2 mm., width .25 mm. They are irregular in 

 outline, nearly cylindrical, broadest near the middle ; feeble and inactive. 

 Color whitish, with a yellowish or greenish tinge. The usual small, 

 fleshy, conical, segmental elevations are present, twelve to each segment, 

 but no bristles were discernible on them. The posterior breathing 



