THK SYRPHIDAE OF OHIO 



59 



Adult — Length 6 to 7 mm. This species may be recognized by the generic charac- 

 ters — yellow thoracic stripes and abdominal cross-bands, and on the fourth and fifth 

 segments, four longitudinal, oblique, yellow stripes or spots; together with the yellow 

 face lacking a complete median stripe. 



Sphaerophoria cylindrica (Say) 



(Plate V, Figs. 71-78.) 



The Ohio A^aturalist, Vol. XII, No. 8, pp. 538-541, Jttne, 191 2. 



Egg — Length 0.9 mm., diameter 0.3 mm. Elongate oval. Females taken in May 

 deposited several dozen, apparently infertile eggs. 



Larva — Length 9 to 10 mm., width 2.25 mm. Color pea-green with two, dorsa 

 longitudinal, white stripes; heart-line only moderately conspicuous. No vestiture 

 except segmental spines. Outer pair of mouth-hooklets present. Larvae of this 

 species can be very certainly separated from those of Allograpta obliqua by differences 

 in the posterior respiratory appendages. 



Ill Spliacrophoria the end of the posterior respiratory appendage is 

 very nicely and evenly rounded off; the two tubes slightly emarginate but 

 not at all divergent at the tip; and all trace of inter-spiracular spines or 

 projections lacking. With the aid of a good hand-lens and Figures 66 

 and 68 compared with 72 and 73, one should have no trouble in separating 

 these two species in the larval stage. 



Taken among Aphis brassicae in June and September; on Riimex 

 crispus in June; and on Carduus sp. (Among Aphis sp. ) in August. 



Puparium — Length 5.3 mm., height 2.05 mm., width 2.1 nmi. Le?s strongly 

 elevated posteriorly then in Allograpta obliqua from which it can be separated on 

 characters of the posterior respiratory appendage. Pupation observed on host-plants 

 in late June, September and October. Duration of pupal stage (indoors) 5 to 7 days. 



Adult— Length 6 to 8 mm. Lateral stripe on thorax reaches only to the suture. 

 vSpots on pleurae as shown in Fig. 71 Plate V. Abdomen slender with yellow cross- 

 bands. Legs including coxae, yellow. 



The cock's-comb-gall syrphus-fly 



(Species undetermined) 



(Plate VI, Figs. 91-95.) 



Although I was unable to get these larvae to pupate, their habits are 



.so interesting that the following description is given, though the species 



is as 3'et unknown to me. 



Larva— Length 8 to 10 mm., width 2.5 to 3 mm., height r.5 to 2 mm., distinclly 

 fliltened ventrally, moderately convex above, elongate ovoid in outline. The dorso- 

 lateral carinae are rather prominent as are also the transverse folds of the inttgn- 

 ment. The posterior respiratory appendages are prominent, 0.6 mm. long, 0.4 mm. 

 wide. The color of the larva is pink vinaceous, deep-flesh, or purplish, darker beneath. 



