64 



Legs somewhat hairy ; tibial hooks on the anterior and 

 middle pairs well developed. Wing-cases reaching the middle 

 of the 4th abdominal segment. 



Abdomen ovate, widest across the 7th segment and nar- 

 rowed rather suddenly upon the 9th. No dorsal hooks at all, 

 but a faint impressed median line on the anterior segments; 

 lateral spines on 8 and 9 small, angular ; 9th abdominal seg- 

 ment longer than the 8th and three times as long as the 10th. 

 Appendages longer than the 10th segment, stout pyramidal, 

 laterals one half to one third shorter than the others. 



VII. Dromogomphus Selys. 



One of the three species of this American genus has been 

 found in Illinois. The nymph may be known by the median 

 ridge on the 9th abdominal segment, ending ])ehind in a sharp 

 spine. The imagos resemble those of Goniphiis. 



Dromogo}upliHs sp'niosus Selys. 



Gotnphus sp., Hagen, '85, p. 265, No. 19 (nymph). 



This appears to be quite rare in Illinois, and we do not 

 know that any one has ever taken the nymph within our boun- 

 daries. Walsh records the imago from the Des Plaines River, 

 near Chicago; and Mr. Adams, from Kankakee, July 6, It has 

 been taken in a number of states between Maine and Florida 

 on the east and Texas and Illinois on the west. Kellicott 

 found it common in Michigan July 15 to August 1, and gives 

 the following interesting notes: "The female was several times 

 found ovipositing in a manner similar to Marroiin'a iUinolensis, 

 that is, by skimming the water and every few feet or rods 

 touching the water with the abdominal tip, scarcely checking 

 her speed; at other times I have seen them drop down from 

 an overhanging tree and repeatedlj^ tap the water, remaining 

 in one place after the manner of Lthelhila. Pairs were noticed 

 to fly up into tree-tops, and remain in union for a considerable 

 time." The earliest date is June 5, given hy Williamson. 

 Miss Wadsworth observed an individual devouring a Ccdoptenjx. 

 mac (data. 



