158 Journal New York Entomological Society. t"^^°'- ^xv, 



however, it should not be difficult to raise CJirysops larvae, and a new 

 attempt will be made in the coming season. 



Chrysops spec. — On July y, 1916, 6 P. M., a Chrysops was seen 

 ovipositing on the under side of a leaf of Nuphar (yellow pond-lily), 

 the leaves of which often protrude above the surface of the water, on 

 the north shore @f Carnegie Lake, near the Princeton University boat- 

 house. Unfortunately the specimen escaped, but it was undoubtedly a 

 Chrysops of rather dark appearance, probably either C. univittatus, 

 which is dark and next most common to C. callidus, or C. higens v. 

 morosus, or possibly C. nigcr. Specimens caught near this place be- 

 longed to C. univittatus. The egg-mass was collected and was very 

 different in appearance from that of C. callidus. On careful search 

 five such egg-masses were found, four on the under side of Nuphar 

 leaves, one on the under side of a pontcderia leaf nearby. As eggs 

 of this kind were found nowhere else, it seems that the species has 

 a predilection not only for Nuphar but also for the particular spot 

 where these eggs were found. 



The egg-clusters (Plate XII, figs, i and 2) differ from those of 

 Chrysops callidus and the other species in which the oviposition has 

 been described by the arrangement of the eggs, which are elongate as 

 in the other species but placed with the hind end almost at right angle 

 on the leaf-surface, one close to the other, so as to form a sort of 

 elevated layer, the vertical thickness of which corresponds to the 

 length of the eggs and the even surface of which is formed by the 

 anterior ends of the eggs. The whole cluster is roundish or ovoid 

 in outline, the sides almost right-angled, formed by the rows of eggs 

 placed one beside the other. One of the clusters was found, by actual 

 count, to consist of 352 eggs. The color of the freshly laid one was 

 white, as well as in two of the others when they were found, while 

 in the two remaining it was pale brownish. On the following day 

 the three white egg-clusters had also assumed a brownish color, a 

 proof that they had been freshly deposited when found. It results 

 therefore that this species of Chrysops differs from C. callidus not 

 only in the way the eggs are deposited and their color, but also in the 

 time of oviposition which in this species is the early evening, before 

 sunset. 



Owing to the lack of the dark pigment which obscures the de- 

 velopment of the eggs in C. callidus, in this species developmental 

 changes may be readily observed. 



