Sept., I9I7-] Marchand: Notes on Early Stages of Chrysops. 161 



but not connected with it (Plate XII, fig. lo) ; the space containing 

 the two pedunculate bodies^ seems to be surrounded by a double 

 capsule. 



This egg-cluster perished in consequence of having been placed in 

 too damp conditions, which caused the leaf to which it was attached, 

 to disintegrate. The leaves of NupJiar decomposes with great rapid- 

 idty when detached from the plant. 



However, eggs from another cluster of the same species were 

 found hatched on July 9, at 11 A. M. The larvae were positively 

 phototropic, and much like those of C. calUdns. They were kept alive 

 for one week in a Petri dish with Ccratophylliim and crushed Agrion 

 larvae, but after this period all died. 



A third type of egg-cluster was found several times on leaves of 

 Sagittaria and Nnphar, and of which I can not say whether it be- 

 longs to a Chrysops or a very small species of Tabauus. These egg- 

 clusters are obliquely conical, brown in color; the eggs of which they 

 consist, are elongate as in the other species." Larvae which hatched 

 from one of these clusters had more the appearance of Chrysops 

 than of Tahanns, this (i) because of their small size, (2) because of 

 the tracheje being narrow as in Chrysops caUidns and the other species 

 spoken of. They were evidently aquatic but perished within a few 



days. 



EXPLANATION OF FIGURES. 



Plate X. 



Fig. I. Female of Chrysops callidiis O. S., ovipositing on a leaf of Typha. 

 Drawn from life. 



Fig. 2. Egg-cluster of Chrysops callidus, somewhat abnormally shaped. 



Fig. 3. Single egg of the same species. Upper half white (tip translu- 

 cent), lower half transparent. 



Fig. 4. Newly-hatched larva of Chrysops callidus. Prolegs still retracted. 



1 It has not been ascertained whether these bodies were pedunculate or 

 not, as the organ of Graber was not known to me then, and no descriptions 

 were at hand. I use here the term " pedunculate bodies " as used by the 

 authors on the subject, for the black bodies readily seen in the capsule which 

 in Tabanus have been shown to be " pedunculate." 



2 I notice in this connection J. S. Hine's statement that the egg-masses of 

 Chrysops celer consist of several layers of eggs, being brownish in color. 

 Presumably, then, the egg-masses spoken of belong to C. celer or to a related 

 species. 



