58 THOMAS SAY FOUNDATION 



ft. by J. R. Selvin and now in the collection of the Califor- 

 nia Academy of Sciences. 



Perlodes irregularis Banks. 



(Plate 7, fig. 24; plate 10, fig. 7.) 

 ]900. Dictyoptryx irregularis Banks, Trans. Amor. Ent. Sue., 26:243. 

 1907. Perlodes irregularis Banks, Can. Ent., 39:327. 

 1932. Megarcys irregularis Kip., Coll. Zool. Selys, 4:12. 

 1917. Megarcys signata Smith, Trans. Amer. Ent. Hoc., 4M:472. 



Male. Length to wing tips 20 mm. ; expanse 32 mm. 



Female. Length to wing tips 28 mm. ; expanse 48 mm. 



Color brown, varied with yellow. Top of head with 

 two irregular black bands that converge toward the oc- 

 ciput, surround a conspicuous yellow crown spot, meet at 

 the middle ocellus and diverge again along the middle 

 parting of the obscure yellow M-line that crosses the 

 irons. Outside the brown a yellow band on each side ex 

 tends forward from the occiput surrounds the eye dor-, 

 sally, covers the oval frontal tubercle, and follows the out- 

 er leg of the M-mark down on the sides of the clypeus. Be- 

 hind the eyes the hind angles of the head are blackish ; 

 dorsal half of basal segment of antennae blackish ; ventral 

 half yellow, remainder obscure, darkening beyond the 

 third segment to the apex, palpi obscure. Prothorax 

 squarish with convex front and hind margins set off by 

 transverse grooves and with a rather deep middle sulcus. 

 Mid dorsal line of yellow, broad and conspicuous, widened 

 at the ends. Embossed markings at sides of disc mar- 

 morate black. A fuscous background, vermiculate, but 

 few of the markings in the outer fourth of the area. 

 Wings fuscous with brown veins, faintly cloudy on the 

 crossveins of arculus and cord. Legs yellow, conspicuously 

 marked with fucous as follows: the dorsal sixth of the 

 tibiae, a subapical wing on femora that runs proximaliy 

 in two vanishing streaks, and one or two marks across the 

 base of the femora on the dorsal side. 



Abdomen tawny fuscous, the color deepening toward 

 the apex, venter paler with three dots in a row across 

 each of the middle segments ; the ninth segment blackish 

 except on its projecting rear margins above and below. 



Male. Segments normal to the ninth, that segment 

 abbreviated dorsally and bearing just before the hind 

 margin a conspicuous bilobed transverse reddish crest, 

 sides oblique, and vents prolonged into a broad scoop-like 

 subgenital plate, upcurved on their margin and pale red- 

 dish or yellowish in color. This extension of the sternite 



