NORTH AMERICAN NEUROPTERA. 289 



represents a deformity. I received from Kooloo two female imago of 

 C. hrev'istigma Monogr. Gomphin, p. 329, considered by me years ago 

 to be only C. bidentafus, which seems to be corroborated by the nympha6 

 from Kooloo. At least I am unable to find any differences. A detailed 

 description of the nympha raised by Dr. Brauer is given by me in Stettin. 

 Entom. Zeit. 1853, xiv, p. 265, by Dr. Brauer Neur. Austr. p. xv, and 

 by Cabot p. 14. Comparing these descriptions with the new one given 

 above no difference will be found. Prof. Zeller's specimen arrived only 

 in 1876. 



46. Cordulegaster dorsalis (supposition). 

 Selys Monogr. Gomphin. p. 347. 



Two full grown female skins by Mr. J. Behrens, and one half grown 

 male, dry, by Mr. H. Edwards all from California. Length 43 to 27 mm. 



The full grown skin is very similar to C. bidentafus, but the body 

 less bulky, the head narrower, its sides more rounded to occiput ; third 

 joint of antennae shorter ; abdomen narrower ; no lateral spines. 



As there is only one species known from California and the North- 

 western States, the nympha may belong to C dorsalis. 



46. Cordulegaster aiiiiiilaius (raised). 



Selys Monogr. Gomphin. p. 333 ; Cabot p. 14, pi. iii, fig. 3. 

 Hagen Stettin. Ent. Zeit. xiv, p. 265. 



A female nympha skin, raised by Mr. McLachlan, England ; a dry 

 nympha, half grown ; from Luenburg, Hanover, by Mr. Heyer. Length 

 40 mm. and 30 mm. 



Dark brown, hairy; large, stout; head large, breadth twice the length; sides 

 straight; the jJosterior half rounded, running semi-circularly to occiput, which is 

 half as broad as the fore border; eyes forming a small, orbicular, prominent globe 

 on the front angles, inside prolongated to the vertex; the prolongation is trian- 

 gular, separated by a slight furrow from the globe and has finer facets ; the part 

 behind the eyes is separated by a sharply defined curvate line, and rough by small 

 flat tubercles, which are more numerous along the sides and crowded behind the 

 eye-globe, having there the appearance of flat scales; on each side near the me- 

 dian suture a rounded spot and a larger ill defined one near the lateral margin: 

 the latter one with some irregular lines; vertex small, rounded, the lateral ocelli 

 more defined ; front border between the antennae semi-circular, flat, prominent, 

 with a comb of long flattened spines; antennae as long as head, 7-jointed, slender, 

 tapering, inserted in a cylindrical socket as large as first joint; the two basal 

 joints short, thicker, second a little longer ; third joint longer than fourth and fifth 

 together; the last four joints short, of equal length ; seventh sharply pointed ; the 

 point of it imitating an additional joint; mask like C. bidevtaiun ; the margin 

 of palpus forming three large teeth, lacerated by indentures forming a number of 

 smaller teeth ; prothorax like C. bidentatus, but a little less broad ; wing cases 

 reaching 4th segment; abdomen as broad as head, long about three-eighths of 



TRANS. AMER. ENT. SOC. (41) DECEMBER, 1885. 



