LEONARD HASEMAN. 327 



The pupae were found along with the larvse, though usually a 

 little higher up on the rock. They are 2.5 mm. in length and 2 

 mm. wide at the middle; broad, shield shaped, flat and adherent. 

 The pair of short, clavate, prothoracic breathing tubes are cylindri- 

 cal, with a fine mesh-work covering. The dorsal surface is strongly 

 chitinized, while the flat, adherent ventral surface is not, and the 

 folded wings and legs lie uncovered, although protected by the dor- 

 sal wall. The pupae are without ventral suckers, but the adhesion 

 is sufficient to prevent the occasional splashes of water which strike 

 them from carrying them away. The pupae were found March 1st, 

 and the larvae were first noted at this time also. By the 5th of 

 April they were more abundant than the lavae, and adults were 

 emerging at that time. 



The egg, larval and pupal stages of the Florida Psychodid are 

 discussed separately. The adult fly is described in the first part of 

 this paper as Psychoda floridica n. sp. 



EGG. 



The eggs are laid in irregular shaped masses, presumably on the 

 surface of the water, or on objects at the surface, where they are 

 kept moist by the water drawn up by capillary attraction, for the 

 young larvae were first found on the sides of the jar just above the 

 surface of the water. The single packet which the writer was so 

 fortunate as to find contained about three hundred eggs, and each of 

 the two packets, from which the two broods of larvae came, must also 

 have contained at least three hundred. About half of the eggs con- 

 tained in the packet were placed in a shallow vessel of water, but 

 none of them developed. Either they were not fertilized or their 

 natural place of deposition is not under water. The former is, per- 

 haps, the correct explanation for their failure to mature. 



The egg is about a quarter of a millimeter in length, oval in 

 shape, and with its length equal to three times its middle diameter. 

 The yolk composes about half of the egg and is centrally located, 

 causing that part to be quite opaque, while the remainder is clear. 

 The wall of the egg appears to be divided up in small, circular pat- 

 terns. As to the time required for the eggs to hatch the writer is 

 unable to make a definite statement, but judging from the appear- 

 ance of the second brood, he would place the upper limit at seventy- 

 two hours, and most likely a shorter time is sufficient. 



TRANS. AM. KNT. SOC. XXXIII. OCTOBER, 1907. 



