82 



The following brief statement of the characteristic features 

 of the nymph is selected from Dr. Hagen's description. 



Length, 19 to 24 mm. Body rather slender; median labial 

 lobe very faintly rounded, lateral lobes ending in a strongly 

 bent and pointed hook, with four strong teeth inside; abdomen 

 tapering slowly after segment 6, segments as far as 8 of equal 

 length, 9 a little longer than 8, 10 half as long as 9, cylindrical; 

 lateral spines on 6 to 9, the last one third as long as 10; dorsal 

 liooks very small, pointed on 6 to 9; appendages as long as last 

 segment; third joint of hind tarsi scarcely longer than second. 



15. Gomphus conudus Tough. 



G. corn u ills Tough, C'oo). 



This recently published species, readily recognized by the 

 unusual form of the male abdominal appendages, was described 

 from two males from DuPage county, taken May 30 and June 14. 

 The Bolter Collection contains additional male and female ex- 

 amples, but without data. 



16. Gonqjliifs S]). (b). 



Go)nphus sp., Hagen, '85, p. 262, No. 14 (nymph). 



This interesting species, described by Hagen from three 

 nymphs collected by Prof. Forbes at Cairo, 111., July 26, is quite 

 distinct from any other known to us. The following are the 

 principal distinctions: 



Length, 18 to 23 mm. Body flat; lateral labial lobes with 

 only two incisions near the strong and sharp apical hook, 

 median lobe slightly rounded; side margins of abdomen very 

 hairy, segment 9 as long as 8, 10 very short; lateral spines on 6 

 to 9, the last less sharp, as long as 10; no trace of dorsal hooks; 

 appendages as long as 9, broad; anterior tibial hooks short. 



17. Gompliiis sp. {c). 



Gomphus sp., Hagen, '85, p. 263, No. 15 (nymph). 



A single nymph received from Newport, Ky., by Dr. Hagen 

 is similar to the preceding, but was believed by him to be a 

 distinct species, perhaps G. ^ninutus. 



