1(3 SYNOPSIS OF THE SPECIES DESCRIBED. 



6. G. species. 



Nympha. Pole Creek, Texas. Mask quadrangular, front border of the middle third 

 finelv denticulated : palpi blunt, very finely denticulated ; abdomen with dorsal hooks on 2d 

 to 9th : lateral spines on 7th to 9th ; the lateral spines of segment 9 much shorter than seg- 

 ment 10 ; anal appendices longer than segment 10, sharp, of nearly equal length. 



B. Front border of the mask produced at middle third in a cleft lobe. 



Sub-genus: Cyclogomphus. Selts, 1. c p. 105. (Supposition.) 



7. G. Species. 



Nympha, full grown. Himalaya, Ghugger Pir. Body flat : mask quadrangular, front- 

 border produced at middle third in elliptical lobe, cleft in the middle, with comb of bristles 

 thickened at base ; palpus with molar incisions to the end hook. Abdomen flat; no dorsal 

 hooks: lateral spines on 5th to 9th : lateral spine of segment 9 halt' as 1 ■ _ nt 10 ; 



anal appendices a little longer than segment 10, of equal length, sharp. 



C. Front border of the mash cut straight. 



Sub-genus: Macrogomphus. Selys, 1. a, p. 87. (Raised.) 



8. M. spiniceps Walsh. Proc. N. H. Soc., Phila., 1862, p. BS9. 



Xympha, full-grown male and female. Lawrence. Mass, liaised by Mr. Fr. G. Sanborn. 

 Body long, narrow : mask quadrangular, front border cut straight. Abdomen som what 

 conical, tapering : segment 9th twice as long as the foregoing, narrowed in the middle ; no 

 dorsal hooks: segment 6 to 9 with lateral spines: anal appendices as long as the 10th -ce- 

 ment, which is short and slender, of equal length, pyramidal. 



Legio II. Gomphoid.es. Selts, 1. c, p. 189. 



The general character is not yet given, all species, except one, determined merely by sup- 

 position, the determination of some doubtful. 



A. Antenna; with the third joint long, the fourtli 1 length of the third : middle legs nearer at 



base than fore legs. 



Sub-genus : Progomphus ? Selys, 1. c, p. 194. (Supposition.) 



9. Progomplws species ! 



Nympha, full-grown male and female. Wareham, Mass. ; Carundahy, Brazil. There is 

 no genus known to be living in both countries; Progomphus liyes in Brazil, though the 

 locality, Massachusetts, is doubtless correct. If the determination is erroneous, as is possible, 

 no other seems more probable. 



Body lanceolate ; antenna?, 3d joint long, dilated : 4th small, cylindrical. \ length of 3d ; 

 mask reaching fore legs, long, front-border produced in semicircular lobe, with a comb of flat- 

 tened hairs; palpi blunt, smooth inside; middle legs nearer at base than fore legs; tarsi 

 knife-jhaped, bent up. Abdomen flattened: segments 1 to 9 with dorsal hooks: segments 

 5 to 9 with lateral spines : anal appendices of equal length, sharp ; the lateral ones half as 

 long, blunt. 



B. Antenna; 'cith the third joint long, the fourth very short, linear ; middle legs and fore legs 



equally distant : segment 1 very elongated. 



Sub-genus: GrOmphoides. SELYS, 1. C., p. 206. (Supposition.) 



10 Oomphoides species. 



Nympha, male. Sta Cruz. Brazil. Body long, slender: antenna? 3d joint long, dilated ; 

 -Ith short, linear; mask a little beyond fore legs, long; front border middle tliird produced in 

 semicircular lobe; palpi hooked at tip. smooth inside: middle legs and fore leas equally dis- 

 tant at base; ta-si knife-sbapel. Abdomen long, conical: segment 10 exceedingly long, 

 cylindrical; segment 4 to G with small dorsal hooks; lateral spii es i segment 7 to '■> : anal 

 appendices very short, all of equal length. (An Apbylla hrevipes Selys V) 

 11. Oomplioides species. 



Nympha, female, not lull grown. Rio dos Macacos. Brazil. Very similar to the fore- 

 going; dorsal hooks on segments 4 to 9. Perhaps a sexual difference '/ 



