874 PROCEEDINGS OF THE ACADEMY OP 



yellowish, with the tips of femora fuscous, and the tarsal incisures and tips a 

 little cloudy. Wings hyaline, with a pale ferruginous cloud along the costal 

 tip ; veins and cross -veins moderate, subequal, fuscous, except the three 

 costal veins which are coarse, yellowish on their basal two-thirds, fuscous on 

 their terminal one-third, where the cross-veins also are coarse, the oblique 

 basal cross-vein being always very coarse ; half way to the tip the second 

 costal vein is always thickened and obfuscated for the length of half a milli- 

 metre, sometimes obviously, sometimes indistinctly. 



The 9 is paler than the $ ; the vertex and thorax being rather luteous 

 than ferruginous, and the dorsum of the abdomen pale fuscous, or pale ferru- 

 ginous, with no appearance of any vittae ; in one specimen the setae are imma- 

 culate, except at the extreme tip ; the costal cross-veins are hyaline on their 



Length tf 913 mill. 9 10-13 mill. Exp. g 2431 mill. $ 2734 mill. 

 Seta d 2738 mill. $ 2728 mill. Ant. leg $ 13 mill. 9 (same size) 10 

 mill. Eleven tf, three 9 . Resembles Bcetis vicaria, Walker, but differs in 

 the coloring of the wing-veins. 



The $ subimago differs from the $ imago in the vittse of the abdomen being 

 obsolete. The setse are obscure greenish, immaculate, pilose ; the anal pro- 

 cesses are immaculate ; the wings are slightly tinged with fuscous, and ciliated 

 behind, and the coloring of the veins and cross -veins is not so strongly marked. 



The 9 subimago differs from the 9 imago in the abdominal joints, 1 6 

 being of a deep egg-yellow, from the included eggs showing through the in- 

 tegument ; the seta is pale, a little fuscous at tip ; the wings are subflaves- 

 cent, subopaque, ciliated behind ; the veins yellowish, and the cross-veins 

 also yellowish, except on the disk and tip. 



Length <$ 10 mill. ; 9 Hi mill. Alar exp. J' 29 mill. ; 9 30 mill. Seta 

 <? 17 mill. ; 9 13 mill. Ant. leg $ 9 10 mill. One tf, one 9 . 



Palingenia (Bjetis) interpunctata, Say. tf Yellowish. Eyes in the living 

 insect pale greenish yellow, a black longitudinal line dividing them into two 

 equal parts. Ocelli with fuscous orbits ; a black spot on each side between 

 the eyes, sometimes indistinct from the vertex being obfuscated ; beneath 

 each antenna a black spot, a little elongated transversely, but not angulated, 

 except when viewed obliquely. Prothorax with a basal triangle, and a line 

 on each side black ; dorsum of thorax piceous. Abdomen pale obscure green- 

 ish ; a dorsal line generally wide, sometimes narrow, and the terminal J of 

 each joint piceous ; the last two or three joints almost entirely piceous ; the 

 dorsal line, when wide, incloses on joints 1 6 or 1 7 a lateral pale spot ; 

 venter pale obscure-greenish, with the tips of the segments darker ; anal 

 appendages pale, sometimes cloudy at tip ; setaa pale greenish, the incisures 

 distinctly but narrowly fuscous, except in one immature specimen. Anterior 

 legs pale greenish yellow, with a medial and terminal band on the femora, 

 the tips of the tibia? and the tarsal incisures and tips fuscous ; four hind legs 

 somewhat paler, but similarly marked, except in a single specimen, where 

 the medial band of the femora is subobsolete, and except also that only the 

 extreme tip of the tibia? is fuscous. Wings hyaline, clouded with yellowish 

 brown on the costa, especially on the terminal one-third ; the veins fine, except 

 the three costal veins, which are coarse ; the cross-veins rather coarse, on the 

 costa very coarse ; all fuscous, except the basal two-thirds of the three costal 

 veins, which are yellowish ; on the middle of the costa, between the third 

 costal vein and that immediately behind it, is a very coarse black streak, 

 about one-half millimetre long. The hind wings are always distinctly tipped 

 with brown. 



The 9 differs from the <$ as follows : The basal triangle of the prothorax 

 is generally reduced to a black dot ; the dorsum of the thorax is luteous. The 

 abdomen and venter are egg-yellow, from the included eggs showing through, 



[Sept, 



