79 



this species in the State Laboratory collection from Swan 

 Pond, near the Wabash River in southeastern Illinois. The 

 nymphs were exceedingly abundant at Ithaca. Two distinct 

 .sizes were observed, a fact which, taken in connection with 

 the extremely short period of emergence, strongly indicates 

 that the species takes two years to complete its. life cycle, 

 the nymph hatching in one season not transforming until 

 the second season thereafter. Two males were all the imagos 

 seen at large, yet exuviae m countless numbers lined the banks 

 of all streams. The perching habits of these two males were 

 about as described further on for G. pallkhis. The imago has 

 been taken as far west as Michigan and Ohio. It flies in early 

 summer, the recorded period being May 30 to June 26. 



Kellicott says of villosipes, exilis, and furcifer that they 

 "frequent quiet waters of smaller ponds, or even ditches where 

 there are floating algae or lily-pads on which to rest. The 

 males explore the borders and watch from the muddy shore or 

 floating plants ; the females at intervals drop down from their 

 coverts to oviposit among the plants, dipping into the water in 

 a manner similar to that of LibeUida.''^ 



The nymph measures 37 mm.; abdomen, 24 mm.; hind 

 femur, 6 mm.; width of head, 5.5 mm., of abdomen 8 mm. 



Form identical with that of G. paUidus. Lateral margins 

 of apical segments of abdomen marked rather showily with 

 yellowish, especially beneath. Labium as in G. pallidus, but 

 with the fringe of hairs bordering the median lobe shorter, the 

 lateral lobe arcuately incurved at the apex, its extreme point 

 shorter than the first of the six stout posteriorly-directed teeth 

 upon the inner margin. Lateral spines well developed only on 

 the 9th segment. Dorsal hooks almost entirely wanting, even 

 on the 9th segment. Appendages shorter than the 10th seg- 

 ment, the laterals a little shorter than the others. 



13. Gomphus pallidus Ramb. 



Mr. Needham studied this species at Purington Lake, near 

 Galesburg, where it was found in company with G. graslinellus. 



