NATURAL SCIENCES OF PHILADELPHIA. 373 



Palingenia. 



\\ Palingenia. Subgenus A. First tarsal joint distinct in the anterior legs, 

 indistinct and connate in the four posterior legs ; legs short, hind legs not 

 nearly attaining the tip of the abdomen ; intermediate seta rather short; eyes 

 of <$ separated by a space as wide as the orbit of the posterior ocellus. 



Palingenia vittigera, n. sp. <j" Yellowish. Ocelli and vertex piceous ; 

 antennae pale ferruginous, seta whitish at tip. Prothorax piceous on its dor- 

 sum ; thorax piceous to the base of the wings. Abdomen piceous on its dor- 

 sum, dorsum of each joint with two narrow, yellowish, divergent basal vittae 

 extending half way to its tip; anal appendages yellowish; setae whitish, im- 

 maculate. Legs yellowish, anteriors with the base and tips of the tibiae, and 

 the tarsal incisures and tips fuscous; four hind legs with only the tips of the 

 tibiae and the tarsal tips fuscous. Wings hyaline; veins and cross-veins fine, 

 subequal, hyaline, except on the costa, where they are coarse, the first vein 

 fuscous at base, yellowish at tip ; the second and third yellowish throughout; 

 the costal cross veins fuscous at base, becoming yellowish towards the tip of 

 the costa; in the hind wings two costal veins, with their connecting cross-veins, 

 are pale fuscous. 



Length tf 18 mill. Alar expanse tf 32 mill. Setae tf about 40 or 50 mill. 

 Intermediate seta $ 5 mill. Anterior leg $ 9 mill. ; $ unknown. 



^Palingenia. Subgenus B. First tarsal joint distinct in the anterior legs, 

 indistinct and connate in the four posterior legs ; legs short, except the $ an- 

 terior legs, hind leg not attaining the tip of the abdomen ; intermediate seta 

 rudimental; eyes $ separated by a space twice as wide as the orbit of the 

 posterior ocellus. 



Palingenia limbata, Pictet, (= No. 4, P. bilineata, Say, apud Hagen,) P. 

 bilineata, Say, (= No. 5, P. limbata, Guerin, apud Hagen.) An attentive com- 

 parison of Say's description with Dr. Hagen's diagnoses will, I think, satisfy 

 any one that Dr. Hagen has wrongly identified Say's species, and that his No. 

 5, not his No. 4, is the true bilineata, Say. The following particulars in Say's 

 description apply to No. 5, as described by Dr. Hagen himself, and not to No. 4: 

 "Prothorax blackish each side and before;" "wings hyaline, whitish, with 

 fuscous nervures ;" [Say describes the $ of his species, and the 9 of No. 4 

 has yellowish wings with yellow veins ;"] " a double series of whitish, oblique" 

 [typographical or clerical error for oblong ?] " dilated abbreviated lines" 

 on the abdomen. Moreover, Say describes it as " appearing in considerable 

 numbers." Now, No. 5 positively swarms at Rock Island every summer, and I 

 found it in similar profusion in Southern Illinois on the Ohio River; No. 4, on 

 the contrary, is quite rare ; I have met with only nine or ten specimens in five 

 years near Rock Island, and in Southern Illinois I did not meet with any at 

 all. Mr. Uhler agrees with me, as appears from his note in Say's Works, 

 (i. p. 203.) 



Palingenia. Subgenus C. First tarsal joint distinct in all the legs, freely 

 movable by the living insect in the anterior legs ; legs all long ; hind legs 

 much more than attaining the tip of the abdomen ; no intermediate seta ; eyes 

 (J*, separated by a space at least as wide as the orbit of the posterior ocellus. 



Palingenia flavescens, n. sp. $ Yellowish. Ocelli fuscous ; vertex fer- 

 ruginous ; seta dusky, whitish at tip. Thorax ferruginous, sometimes verging 

 on piceous. Dorsum of abdomen ferruginous, joints 1 6 darker at tip, and 

 with two subobsolete pale basal vittae on the dorsum ; venter pale greenish, 

 except the three or four last joints ; anal processes pale, fuscous at tip ; setae 

 whitish, the incisures fuscous, occasionally towards the base alternately white 

 and narrow. Anterior legs pale ferruginous ; a medial and terminal band on 

 the femora, tips of tibiae and tarsal incisures and tips fuscous ; four hind legs 



1862.] 



