16 SYNOPSIS OF THE SPECIES DESCRIBED. 



6. O. species. 



Nynipha. Pole Creek, Texas. Mask qnadranptular, front border of the mirUUe third 

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

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

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



B. Front harder of the mofk produced at midille third in a cleft lobe. 



Sub-genus: Cyclogomphus. Selys, I. c p. 10."). (Supposition.) 



7. O. Species. 



Nympha, full grown. Himalaya, (Jhugger Pir. Body Hat; 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. Abdcmien flat; no dorsal 

 hooks; lateral spines on 5th to 9th; lateral spine of segment 9 halt' as long as segment 10 i 

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



C. Front border of the nxi.^k cut slriii(/ht. 



Sub-genus : Macrogomphus. Ski-ys, 1. c, p. 87. (Rai.sed.) 



8. M. spilliceps W.vi.sn. Proc. N. H. Soc, Phila., 18G2, p. 889. 



Nympha, full-grown male and female. Lawrence, ]\Iass. Raised by Mr. Fr. G. Sanborn. 

 Body long, narrow ; mask quadrangular, front border cut straight. Abdomen soni what 

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

 dorsal hooks ; segment 6 to 9 with lateral spines ; anal appendices as long .as the lOih seg- 

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



Legio II. Gomphoides. Selys, 1. c, \>. 189. 



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

 position, the determination of some doubtful. 



A. AntenncB with the third joint long, the fourth ^ length of the third ; middle legs nearer at 



base than fore legs. 



Sub-genus : Progomphus ? Selys, 1. c, p. 104. (Supposition.) 



9. Progoiiipliiis species ! 



Xyuipha, full-grown male and female. Warehara, Mass. ; Carundahy, Brazil. There is 

 no genus known to be Hying in both countries; Progomphus lives 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:-, Zd joint long, dilated; -Itli sm.ill, cylindrical. \ length of 3il ; 

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

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

 knife-shaped, 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. Antennae tcith the third joint long, the fourth very short, linear; middle legs and fore legs 



equalbj distant; segment 10 very elongated. 



Sub-genus: Gomphoides. Selys, 1. c, p. 206. (Supposition.) 

 10 <iioniplioid4>s species. 



Xyin]>ha. male. .Sta Cruz, Brazil. Body long, slender: antcnn;c M joint long, dilated; 

 4th sliort. linear; mask a little beyond fore legs, long ; front bonier miildle third produced in 

 semicircular lobe; palpi hooked at tip, smooth inside; middle legs ami fore legs ecpially dis- 

 tant at base; taisi kniti'-shape I. Abdomen long, conical; segment 10 excee(iin;;ly long, 

 cylindrical ; segment 1 to U with small dor.sal hooks ; lateral spines on segment 7 to 9 ; anal 

 appen<iices very short, all of cfjunl length. (An Apliylla brevipcs Selys V) 

 11. Ooiiiplioides species. 



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

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



