314 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxni. 



with a continuous but little wider black stripe; no trace of black 

 posteriorl3^ Costa yellow, stigma black. Femora largely yellow, 

 apically and externally with some brown; tibia? black. 



Abdominal segment 1 with a dorsal interrupted crescent of brown, 

 the ends of the crescent reaching backward and downward ; 2 yellow, 

 wdth a superior lateral brown stripe which at the apex of the segment 

 meets its fellow dorsally; 3 yellow, black as follows: A very narrow 

 basal ring, an interrupted median ring and a lateral apical triangular 

 spot which meets its fellow dorsally; 4 similar to 3; 5-7 similar, the 

 apical black spots confluent dorsally to form apical rings covering 

 about one-half the segment; 7 with the median transverse black 

 line reduced to a trace; 8-10 black; 8 with a large lateral basal yel- 

 low spot, the merest trace of which exists on 9; the suggestion of a 

 dorsal basal spot on 8. 



Superior appendages twice as long as 10, simple, slender, tapering, 

 curved toward each other and downward, the extreme apex with a 

 shining black tooth, the lower external edge on the curve before the 

 apex minutely denticulate; brown at base, shading at once into light 

 yellow. Inferior appendage a little more than one-half as long, 

 broadly bifid for more than one-half its length, the branches simple, 

 rounded, tapering, widely and continuously divaricate, but little 

 recurved dorsally, terminating apically in a minute tooth; color 

 similar to the superiors. 



While the single male has served for a fairly complete description, 

 its condition is such as to make figures of the appendages of ques- 

 tionable accuracy, and future study by others of this specimen will 

 be difficult. For this reason it is unnamed, though M. Martin, who 

 has seen it, pronounces it as certainly new. 



As to its generic position some discussion is necessary. I should refer 

 it to Onychogomphus without question were it not that Foerster has 

 described as Heterogomplius naninus a male from Tonkin which is a 

 darker colored but, I believe, closely allied species to the one described 

 above. In actual usage describers of new species have defined Ony- 

 chogomphus solely by one character, the form of the inferior appendage 

 of the male ; and De Selys in naming species based on female speci- 

 mens alone has followed the generic name Onychogomphus with a 

 question mark. In this Burman specimen the superior append- 

 ages are similar to the form found in a number of species of Onycho- 

 gomphus, and had the inferior been lost, few would hesitate to refer 

 the specimen to Onychogomphus. Moreover, the form of the inferior 

 appendage throughout the genus, as heretofore understood, can 

 hardly be defined as of one type, if we may use Hagen's figures in 

 Monographic des Gomphines for comparison. The figure of 0. jiexu- 

 osus certainly shows a decided step away from 0. saundersii, for 



