June, 1912.] 
Life- Histories of Syrphidae IV. 
539 
of poorly defined pro-leg-like projections of the body on the ventral 
side. The mouth-parts (Fig. 77) consist of three pairs of hooklets 
in addition to the pair of jaws. One pair of hooklets is short and 
heavy, triangular, lateral in position (Fig. 77, d), the other two 
pairs, situated close beside the jaws (c), are slender, elongate, 
slightly curved. The jaws ( b ) are of the usual type but U-shaped 
rather than V-shaped, the shoulders rather prominent, with a 
median, terminal, pointed projection. 
The antennas (Fig. 77, a) and anterior spiracles are rather well 
elevated. The latter on a fleshy base with a prominent constric- 
tion beyond the middle showing at the apex a small number of 
rounded teeth or lobes about three larger and three smaller ones. 
(Figs. 74, 75). 
The shape, color and general appearance is very similar to the 
larva of Allograpta obliqua. So much so in fact that I was unable 
for a long time to distinguish the two and was being constantly 
baffled by the issuance of adult Sphcerophoria from my stock of 
supposedly Allograptid larvae and pupae. There is an indefinable 
difference in the naked eye appearance as near as I can express it, 
due to the more finely and evenly granular appearance of the fat 
bodies visible through the dorsal wall in Sphcerophoria. But I am 
not sure that this is constant. 
The two species can, however, be very certainly and definitely 
separated on the basis of the posterior respiratory appendages. 
These are about the same length and other dimensions ; the differ- 
ence lies in the distal end. As described in Allograpta obliqua the 
two tubes are slightly divergent at the tip making them broader 
here than at mid -length, and bear between each two spiracles a 
short, but readily visible, spur-like elevation continued as a slight 
ridge down the side of the tube. Now in Sphcerophoria cylindrica 
the end of the tube is very nicely and evenly rounded off; the 
spiracles very slightly elevated ; the two tubes slightly emarginate 
but not at all divergent, and all trace of inter-spiracular spines or 
projections lacking. With the aid of a good hand lens one can 
always separate these two species at a glance when the characters 
have once been fixed in mind. (See Figs. 72 and 73 and compare 
Figs. 66 and 68). 
On June 4th larvae of this species were taken from among 
A phis brassicce in a greenhouse on the University Campus. At 
Sandusky, larvae were found commonly on curled dock ( Rumex 
crispus ) June 20th and later. At Lakeville, larvae were taken 
from thistle ( Carduus sp.) among Aphis sp. August 27, 1911. In 
Autumn they are rather common on cabbage, in gardens during 
September. .4 phis brassicce Linn, seems to be their favorite prey, 
though they are not restricted to this species, and may be found to 
be rather ubiquitious. 
