NORTH AMERICAN NEUROPTEKA. 231 



jectiou we can make against the name triedra is that we have been 

 accustomed for fifty years to caudalis — from not having studied 

 Miiller's work. 



2. Leucorliiiiia albifroiis Burmeister. 



[Northern and Eastern Euroj^e ; Switzerland ; Vosges Mountains. 

 — Selys.] 



3. Lreiicorhiuia frigida u. sp. 



Hagen, Proc. Bost. Soc. Nat. Hist, xviii, p. 79, 1875 (no descrip- 

 tion). 



S 9 Massachusetts; % N. Red River, British America; Ontario; 

 Dakota. This is the smallest species excejDt kudsonica, and seems to 

 be rare. 



Length 30 mm. Alar expanse 45 mm. Pterostigma 1.5 mm. 

 Abdomen 19 mm. Inferior wing 22 mm. 



'^ . — Front white, labrum yellowish white, labium black, vertex aud occiput 

 black; head behind and thorax with whitish hairs; thorax pale olive-brown, 

 with two black spots near the legs, but much darker in the adult male. Abdo- 

 meu of the form of albifrons, black ; segments 1-3 pale olive-brown, except the 

 extreme apex of 3; the basal half of dorsal suture of 6 and 7 with a narrow 

 yellow stripe; adult male with segments 1-4 entirely covered by bluish white 

 powder. Legs black. 



Superior appendages black, pointed, with about five tubercles below (PI. x, fig. 

 7). Inferior appendage black, elongated, narrowed to tip, a little emarginate 

 (PI. X, fig. 2). Hamulus wide open, basal branch thin, directed backwards. 



Wings hyaline, venation black, costa and some parts after pterostigma yellow- 

 ish. Anterior wings with a very small black basal spot in subcostal and median 

 spaces ; posterior wings with similar spots, but larger, the one in the median space 

 sending a branch along the border of the wing to form a triangular spot, which 

 is emarginate (PI. x, fig. 17). One male has the wings a little yellowish at base. 

 Pterostigma oblong, brown, a little paler on both sides; 7 antecubitals, 7 post- 

 cubitals. 



9. — Similar; labium white on both sides; abdomen broader, segment 2 above 

 with a large, round, yellow spot, 4-8 with dorsal spots narrowing behind, the 

 last three only short, narrow bands. Appendages black. Vulvar lamina half as 

 long as the 9th segment, bifid to base, valves sharply pointed (PL x, fig. 20). 



This species differs from the others by : first, its small size ; second, 

 the more elongated pterostigma ; third, the inferior appendage of the 

 % and the vulva of the 9 . I think I have seen more specimens, 

 and from other States, but the numerous faunal lists are not yet 

 tabulated. 



4. lieucorhiiiia pectoralis Charpentier. 

 [Northern and Central Europe. — Selys.] 



5. Lieucorliiiiia borealis u. sp. 



Hagen, Proc. Bost. Soc. Nat. Hist., xviii, j). 78, 1875 (no descrij)- 

 tion). 



