NORTH AMERICAN NEUROPTERA. 287 



without internal plate ; the palpus is very large, triangular, with deep 

 and irregular incisions, forming about a dozen of teeth of very different 

 size and length, the opposite ones closely fitting into one another; there- 

 fore the palpi do not meet in a straight line ; the eyes are globular 

 on the anterior angle of head, with an internal triangular projection, 

 more finely facetted ; the antennae are slender, 7-jpinted, the third to 

 seventh forming a thin seta ; all tarsi are o-jointed ; the abdomen above 

 nearly cylindrical, tapering, like a Sphinx chrysalis ; flat below. 



There can be scarcely a greater difference of characters between two 

 groups, and the separation of Cordulegastrina as a sub-family of co-ordi- 

 nate value to Gromphina seems to be fully justified. The nymphae of 

 Chlorogomphus, Petalia, Petalura, Phenes, are not yet known, and specu- 

 lations upon their afl&nity would be out of place. 



Genus Cordulegaster (raised). 

 Selys Monogr. Gomphin. p. 303. 

 The principal characters are given above; the prothorax stigma ia 

 large, open and entirely uncovered ; the longitudinal ventral sutures of 

 abdomen end on the apex of segment 8th, somewhat distant of the lat- 

 eral angles ; there exists on 9th segment a longitudinal groove imitating 

 the sutures, but I have ascertained positively that there is no suture ; 

 small ventral bag-s seem to be in segments 3 to 6. The nymphae of Cor- 

 dulegaster are so very much alike to some of the Libellulina, that they 

 are only to be separated from them by the palpus not meeting in a 

 straight line. The nymphae of the species of Cordulegaster are very 

 much alike and difficult to be separated ; C. hidentatus and C. dorsalis 

 have no lateral spines, the other known species have lateral spines on 

 segments 8 and 9 ; the relative length of third joint of antennae seems 

 to be a specific character. The split of the skin of the head by the 

 change into the imago goes through the eyes just as in the Gomphina. 



44. Cordulegaster bidentatiis (raised). 



Selys Monogr. Gomphin. p. 339 ; Cabot p. 14, No. 17, pi. iii, fig. 1. 



Hagen Stettin. Entom. Zeit. xiv, p. 265 ; Brauer Neur. Austriaca p. 15, Nympha. 



Two females raised Vienna, Austria, by Dr. Brauer, and Graubuend- 

 ten, Switzerland, by Prof. Zeller. 



Male and female in alcohol from Kooloo, Himalaya, by Rev. M. M. 

 Carleton. Length 43 to 35 mm. ; young male 27 mm. 



Large, stout, with long hairs, but not densely; head large, breadth twice its 

 length , sides rounded, running semi-eireularly to occiput, so that the hind border 

 of head is half the width of the fore border; eyes with a small, orbicular, promi- 

 nent globe on the front angles of head, triangularly prolongated inside to the ver- 



