538 The Ohio Naturalist. [Vol. XII, No. 8, 



Syphaerophoria cylindrica (Say). 



(Plate XXX, Figs. 71-7S). 



Egg. 



Length ().!) mm., diam.eter 0.3 mm. Elongate oval, less 

 pointed anteriorly than that of AUograpta ohliqua but scarcely 

 discernible from the latter, or from egg of Syrphus americaiius, 

 except possibly by microscopic examination. 



Color chalk- white, sculpturing very similar to that of AUo- 

 grapta ohliqua. The projecting bodies however, appear, on the 

 whole, to be shorter and broader than in that species, about two 

 or three times as long as broad; distance between any two bodies 

 about one-half the width of the body itself ; number of arms around 

 it 12 to 20, rather short, not much branched. Many of them 

 ending at half the distance across the intervening space. Numbers 

 of bodies around the egg at the middle about 50 ; number the length 

 of the egg from pole to pole, very close to 30. 



A female of this species taken on May 8, 1911, over grass, was 

 confined and fed sweetened water. Four days later, May 12, 22 

 eggs were laid, and two the following day. None of these eggs 

 hatched up to May 22, and were probably infertile, though it is 

 possible that other conditions might have prevented normal 

 development. Another female taken on May 13 laid only 2 eggs 

 May 14; and a third, after being enclosed for some days, oviposited 

 several dozen eggs on May 31. None of these hatched. 



The eggs were deposited in the usual manner, the posterior 

 ventral portion being glued to the surface. These little glistening 

 w^hite eggs seem to have no method of natural protection except the 

 egg-shell which is leathery rather than fragile. 



Larva. 



Length 9 to 10 mm., height 1.25 mm., width 2.25 mm. Elongate 

 oval, tapering at anterior end, somewhat truncate except for 

 respiratory appendage at posterior end, depressed. Outline irreg- 

 ular, dorsal integument much wrinkled transversely, and with 

 lateral, longitudinal carinse. (Fig. 7(5). 



Color pea-green with two, narrow, longitudinal, white stripes, 

 laterad of and paralleling the rather conspicuous dark heart line. 

 These white stripes and other coloring produced as in AUograpta; 

 the stripes attenuated and confluent a little before the anterior end, 

 not reaching the respiratory appendage posteriorly. 



Respiratory appendage brownish black at the tip. The skin 

 is papillose, bare except for the visual segmental bristles which are 

 here short, light-colored and inconspicuous. There are a number 



