232 



Chandler: Megaloptera 



Fig. 8:4. Wings of Dysmicohermes ingens (Chandler; original). 



antennae, size and placement of the ocelli, venation 

 of the wings, and the genitalia are the most useful 

 taxonomic characters. Except for those with black 

 wings, the coloration is very difficult to use or to 

 describe. This is also true of the micro- and macro- 

 sculpture of the pronotum and head. 



Key to the Nearctlc Genera of Coryda lidae 

 Adults 



1. Mandibles large, not concealed by the labrum; cells of 

 the wings with white dots, radial sector usually with 

 6 or more forks; eastern and southern United States 

 Corydalus Latreille 1802 



— Mandibles smaller, when closed mostly concealed by 

 labrum; cells of wing without white dots, radial sector 

 usually with 5 or less forks 2 



2. Cell A, (fig. 8:3) closed distally by anterior fork of 

 vein A 2 which fuses with vein A t for a short distance 

 so that vein A, appears 3-branched; radial sector with 

 only 3 forks, R s and R, fused for nearly 1/2 their length 



3 



— Cell A, (fig. 8:4), closed distally by a cross vein from 

 Aj to A a ; A, 2-branched; radial sector with 4-5 forks 

 4 



3. Antennae of male moniliform, as long as body with 

 numerous erect hairs in a band around each segment; 



Fig. 8:5. Wings of Nigronia sp. (Chandler, original). 



Rj and R 4 with cross vein beyond fork (fig 8:3); western 

 and southern United States. . . . Neohermes 1 Banks 1906 



— Antennae of both sexes filiform, 1/2 to nearly as long 

 as body, without erect hairs; R, and R 4 without cross 

 vein beyond fork; western United States and Canada 



Protochauliodes Weele 1910 



4. Second anal cell (fig. 8:5) not reaching the fork of 

 second anal vein, R s never forked; antennae either 

 serrate or pectinate 5 



— Second anal cell (fig. 8:4) with end closed by posterior 

 branch of second anal vein, R 5 forked near middle; 

 antennae filiform; western United States and Canada 



Dysmicohermes Monroe 1953 



5. Anterior ocellus small, round, more than twice its 

 diameter from the posterior ocelli; costal cells about 

 as long as broad, fork of second anal vein (fig. 8:5) 

 well beyond cross vein between first and second anal 

 vein; black species; eastern United States 



Nigronia Banks 1908 



— Anterior ocellus large, not round, not twice its long 

 diameter from the others; cross vein between first and 

 second anal at or beyond fork of second anal vein; gray, 

 mottled species; eastern United States 



Chauliodes Latreille 1796 



Larvae 



1. First 7 abdominal segments with a large tuft of fila- 

 mentous gills at the base of each lateral gill process; 

 patch of hydrofuge pile on ventral side of 9th and 10th 

 segments; eastern to southwestern United States .. . 



Corydalus Latreille 1802 



— Without filamentous gills at base of lateral gill proc- 

 esses; no hydrofuge pile on 9th and 10th segments 



2 



2. Eighth abdominal segment with spiracles at end of 

 long contractile respiratory tubes which extend well 

 past the end of the terminal claws; eastern United 

 States Chauliodes Latreille 1796 



— If 8th abdominal spiracles situated at end of respiratory 

 tubes, they are short and do not reach middle of 9th 

 segment 3 



3. Spiracles of 8th abdominal segment small, anteromesad 

 to lateral gill processes; lateral wings of submentum 

 pointed at apex; western United States 



Dysmicohermes crepusculus Chandler 1954 



— Spiracles of 8th abdominal segment larger than those of 

 the anterior segments and posteromesad to lateral gill 

 processes; lateral wings of submentum with apex 

 emarginate 4 



4. Lateral gill processes short, 1/2 as wide as abdominal 

 segments (longer in early instars); spiracle of 8th 

 abdominal segment large, situated on short respiratory 

 tube, about as long as wide; western United States 



Dysmicohermes Munroe 1953 



— Lateral gill processes longer, at least as long as 

 width of abdominal segments; spiracles of 8th segment 

 smaller 5 



5. Spiracles of 8th abdominal segment at the end of a 

 short, tapered respiratory tube, about V/ 2 times as long 

 as wide; clypeus narrower than base of vertex where 

 joined; eastern United States Nigronia Banks 1908 



— Spiracles of 8th abdominal segment on posterior edge 

 of 8th segment without respiratory tube; clypeus as 



wide as base of vertex; western United States 



Neohermes Banks 1908 and Protochauliodes Weele 1909 



The genus Corydalis is represented in California by 

 only a single species, C. cognata Hagen 1861. This 

 species is rare in California but has been taken at 

 Sacramento and the Sequoia National Forest. 



'It appears that the genus Neohermes is represented in Cali-. 

 fornia by the single species, N. californicus (Walker) 1869 and 

 that /V. nigrinus Van Dyke is a synonym of Protochauliodes 

 infuscatus Caudell (Editor). 



