81 



In view of existing descriptions and figures, (Cabot, '72, p. 2, 

 No. 2, PI. I., Fig. 3 ; Hagen, '85, p. 266) it will be necessary here 

 to give only those nymphal characters which are distinctive. 



The nymph measures in length 38 mm.; abdomen, 26 mm.; 

 hind femur, 7 mm.; width of abdomen 8 mm., of head 6 mm. 



Body flat, elongate, gracefully tapering posteriorly; surface 

 but little hairy. 



Labium with median lobe of mentum rather prominent, a 

 median apical tooth on its front margin, in the middle of the 

 usual comb of flat spinous scales ; lateral lobe with a blunt- 

 pointed and incurved apical hook, and on the inner margin 

 seven or eight long irregular teeth, widening apically, and 

 obliquely truncate so as to appear to be directed backward. 



Abdomen lanceolate, attenuate to apex, slowly tapering for 

 half its length, to the cylindrical 10th segment ; a dorsal hook 

 on segment 9, represented on other segments by obtuse ridge- 

 like elevations ; lateral spines on segments 7 to 9, on 7 minute, 

 on 8 short, on 9 long, closely api^ressed, nearly equaling the 

 length of segment 10 ; superior and inferior appendages sub- 

 equal, shorter than segment 10, laterals a little shorter than 

 the others. 



Half-grown nymphs show clearly all these characters. 



14. Goniphiis exiJ'is Selys. 



In the Atlantic coast states from Maine to Maryland this 

 species is often abundant. In Illinois the imago has been taken 

 at Crystal Lake, about 40 miles northwest of Chicago, by Mr. 

 Longley, and at Kensington by Mr. McDade. Williamson 

 records a few examples from Indiana, and according to Kelli- 

 cott it is common throughout Ohio, especially about canals and 

 ponds. Hagen has described the nymph ('85, p. 263), and 

 doubtfully referred to the same species some examples sent him 

 from Kentucky. Dr. Calvert records it as the first gomphid to 

 appear in spring (May 24), its season of flight lasting until the 

 early part of July. The extreme recorded dates are May 9 

 (Kellicott) and July 8 (Williamson). 



