200 NATHAN BANKS. 



palpi brown ; thorax pale brownish, paler on middle, once and a fourth broadei- 

 than long, sides nearly straight, surface much rugulose; legs yellowish, tarsi 

 darker; abdomen pale yellowish (without darker median stripe), setse pale; 

 wings gray hyaline, veins mostly yellowish, basal transversals and cubitals rather 

 brownish, radial sector forks at anastomosis, and the upper branch forks again, 

 its pedicel being two-thirds the length of the fork, six transversals in cubital 

 area, lower branch of cubital fork simple, hind wing has radial sector twice 

 forked as in fore wing. Expanse 22 mm. 



Harper's Ferry, Virginia, August. 



The species of Chloroperla known to me may be separated as 

 below. I have been unable to identify a number of the species of 

 older authors, and they are omitted from the table. 



1. Head without dark marks, except the ocelli and lines connecting them 4. 



Head with some other dark marks 2. 



2. Ocelli are on a solid black triangle and a black spot on front margin of head, 



a median black stripe on prothorax signata. 



Head marks different, no median black stripe on prothorax 3. 



.3. Larger, the side spots on head transverse, middle of head infuscate. 



borealiw. 

 Smaller, the side spots nearly round, middle of head not infuscate. 



coloradeiisis. 



4. The two upper ocelli connected to each other by a black line, from which 



arises a line to the front ocellus, the whole a T mark. . . . virj^inica. 

 No such T mark 5. 



5. Hind ocelli connected to front ocellus by a V mark 6. 



Hind ocelli not connected to front ocellus 7. 



6. Veins mostly pale yellowish biliiieala. 



Veins mostly dark brownish iiiuiilaiia. 



7. Thorax more or less margined with brown or black, wings yellowish 8. 



Thorax not margined, wings greenish iiiibecilla. 



8. Thorax faintly (but plainly) margined with brown, sides small brveij*. 



Thorax plainly margined by jet black, size larger 9- 



9. Thorax broader, sides more straight, and front margin nearly straight, dorsum 



of abdomen with black stripe paoifiea. 



Thorax much moie rounded on sides and in front, abdomen with black stripe 

 ahove inai';;iiiata. 



]Veinoura depressa n. sp.— Head and thorax reddish brown, abdomen 

 brighter reddish, antennte black; prothorax marked somewhat with black, espe- 

 cially on the sides; legs uniform, dull yellowish ; wings faintly tinged with yel- 

 lowish, costal veins and the X black, other veins paler, pterostigma clouded. 

 Head scarcely broader than prothorax; antennse reaching to middle of wings; 

 prothorax slightly broader than long, sides straight, about parallel, angles square, 

 surface faintly rugulose; subcosta of fore wings nearly touches costa before 

 running into the radius, radial sector geniculate at base, cubital sector arising 

 from cubitus, slightly bent down at tip. Length 9 mm. 



Cottage Grove and Divide, Oreg., September (Morse). 

 Easily recognized by reddish color and rather more de[)ressed 

 form than is common in the genus. 



