AQUATIC INSECTS IN THE ADIRONDACKS 44I 



easy to approach and proved not very difficult to capture with a net, when 

 resting on the bridges crossing the stream. 



The eggs are dropped by the female during flight. She descends and 

 strikes the water repeatedly, at points wide apart: 10 to 20 eggs are 

 liberated at each descent. Thus they are well distributed. Each egg 

 (pi. 19, fig, 2) is somewhat spindle fi^rmed in outline with rounded ends, 

 at first of whitish color, becoming yellowish after a few hours. The 

 ovaries of a teneral female from a breeding cage contained no eggs that 

 were nearly mature ; a considerable time must elapse after transformation 

 before oviposition can take place. 



Nymphs of various sizes are always found together. These sizes fall 

 into three or more possible groups of sizes, which may indicate a 

 developmental period of four or more years duration. In other 

 localities I have observed that the nymphs are likely to be found about 

 the deep holes in the creek bed, under lodged driftwood, etc.; but in 

 Little Clear creek they were found everywhere. Even in the shallow 

 fish ponds made by impounding the creek they were so common on the 

 bottom that one or more could be taken anywhere at almost every haul 

 of the sieve net. ii exuviae were picked from the boarded side of one 

 of the ponds in a distance of 20 yards. 



The nymph has been well described by Hagen and figured by Cabot 

 (//. cc). There is no need of repeating the description here, since it 

 will be at once recognized by plate 18, figure 7, and by the characters 

 given in the table. 



LANTHUS 



This genus includes the smallest and the daintiest of our Gomphinae, 

 black species, striped with green. Its two species probably both occur 

 within the state of New York, though but one of them, L. parvulus, 

 has been recorded for the state hitherto. They may be easily distin- 

 guished as follows. 



Abdominal appendages black parvulus 



Abdominal appendages yellow or whitish albistylus 



Lanthus parvulus Selys 



1854 Gomphus parvulus Selys, Acad. Belg. (2) Bill. 21 : 56 

 1857 Gompbus parvulus Selys, Monograpbie des Goiupbiuae, p. 157 

 1861 Gomphus parvulus Hagen, Synopis Neur. N. Am. p. 109 

 1890 Aeshna parvula Kirby, Cat. Neur. Odon. p. 65 (bibliography) 



1892 Gomphus parvulus Banks, Am. ent. soc. Trans. 19 : 352 (listed) 



1893 G o m pbus parvulus Calvert, Am. ent. soc. Trans. 20 : 242 (descrip- 



tion) 



