utomaloijbt. 



Vol. XXIX. LONDON, AUGUST, 1897. No. 8. 



PRELIMINARY STUDIES OF N. AMERICAN GOMPHIN.E. 



BY JAMES G. NEEDHAM, CORNELL UNIVERSITY, ITHACA, N. Y.* 



( Continued froii page 16S.) 



Herpetoiymphiis picliis, n. sp. Male.— Ithaca, N. V. 



Length, 49 mm.; abdomen, 35 ; hind wing, 27. 



Green and brown, varied with black and yellow. 



Face and frons above entirely yellow ; a broad black band between the eyes, 

 including the ocelli ; antennx' black, the extreme rim of their cuplike insertions yellow. 

 Occiput yellow, its border convex, ciliated with black. Rear of eyes brown, paler 

 externally. 



Prothorax fuscous, with a median twin spot greenish. 



-Thorax bright green, very thinly clad with brownish hairs, and faintly striped with 

 brown. Dorsal and both lateral stripes subobsolete. Humeral stripe complete, 

 irregular ; antehumeral, isolated above, and separated from the humeral by a narrow 

 green line. Subalar and antealar carina brown. 



Wings hyaline, flavescent at the base. Membranule minute, pale ; stigma brown ; 

 veins black ; costa faintly yellow externally. 



Femora straw yellow, lineated with black internally and each with a subapical 

 incomplete ring of black. Tibire black, each with an external straw yellow line. 

 Tarsi black ; hind tarsi with a yellowish mark on the second and third segments 

 superiorly. 



Abdomen brown with transverse apical rings of black on segments 2 to 9 ; addi- 

 tional transverse lines of black on segments 3 to 7, at one-third the length of the 

 segments. A middorsal yellow line, diffuse on segments 3 to 6, sharply bordered with 

 black on 7 to 9. Apex of segment 10 and sides of 8 and 9 (except extreme lateral 

 margin, which is black) and appendages yellow. 



Superior appendages scarcely longer than the lOth segment, clad with blackish 

 hairs Seen from above they are divergent half their length, then parallel to their blunt 



*An unfortunate misarrangement of the table for nymphs crept in at 

 the end of the last paper. The two paragraphs immediately preceding 

 the last one on page 168 both relate to Stylurus. They should there- 

 fore be consolidated and preceded by 7. 



Pi of. T. D. A. Cockerell has promptly and very kindly called my 

 attention to an oversight in proposing the name Orcus, which is pre- 

 occupied. I replace it with Arigomphu$. 



