WILLOW SAW-FLIES. 689 



rings. Body transversely wrinkled, but smooth. Head polished, jet black. Anal 

 segment (just above the flap) with two minute black warts, or truncated, slender 

 tubercles. Curls its tail when at rest. (Harris' Corr., p. 270.) 



Saw-fly.— Black ; venter and feet pale. Male : Hypostoma, palpi, and mandibles 

 at base whitish ; orbits above and behind piceous ; thorax dilated, triangular line 

 before the wing, and wing-scale whitish ; wiugs slightly dusky, nervures fuscous ; 

 feet honey-yellow, posterior tarsi black-brown ; terguin black, segments each with a 

 yellow band of which the four terminal ones are interrupted in the middle ; venter 

 pale honey-yellow. Length, one-fourth inch. Female : Orbits all round, whitish ; 

 white line or spot before the wings with about three obsolete black spots before ; 

 feet white, thighs black in the middle, posterior tarsi blackish, tergum black, the 

 bauds obsolete ; venter white and segments blackish. Length, .3 inch. (Say.) 



69. Selandria? sp. 



This species was observed August 20, at Brunswick, Me., eating irreg- 

 ular round holes in the edge of the leaves and spinning a cocoon. 



Larva. — Body slender, cylindrical, slightly compressed. Head small, round, amber 

 colored, as wide as the body. The body pea-green ; the heart very distinct, forming 

 a dark line with a pale yellowish-green line on each side. The thoracic feet rather 

 long. Seven pairs of abdominal legs ; the last (anal) pair modified, being very short, 

 and like the tip of the body, pale lilac ; the first two pairs of abdominal legs larger 

 than those succeeding ; the sixth pair rudimentary. The spiracles connected by a 

 hair line of yellowish green. Length, 8 to 9""". 



70. Selandria sp. 



The larva of this species folds the leaves of different species of wil- 

 low longitudinally^ on one side of the midrib. It spins a cocoon of the 

 usual shape August 28 to 31. 



Larva. — Head large, round, full, amber colored. Body cylindrical, pale, flesh col- 

 ored, tapering towards the end, where are two jet-black acute spines, with a broad 

 base extending anteriorly. Body covered with short hairs, and transversely wrinkled. 

 Length, 6™"". 



7L Nematus sp. ? 



Nematus ? congeneric with one occurring on Betula populifolia, Bruns 

 wick, September 6. 



Larva. — Head small, round, black, body with a lateral ridge ; scalloped ; each seg- 

 ment with three transverse rows of black warts ; the scallops on the lateral ridges 

 black. Thoracic and abdominal false legs, except last pair, blackish. Length, 20""". 



72. Unknown saw-fly larva. 



This species occurred on the willow at Brunswick, Me., spinning a 

 cocoon July 17. 



Larva. — Seven pairs of abdominal legs. Head glaucous green ; eyes black. Body 

 pale glaucous green, including the thoracic and abdominal legs ; the body frosted, 

 with a double dorsal whitish line, and one on each side below. 



7.3. NematU8 ? larva. 



Observed at Jackson, N. H., on the willow. 



Larva. — Body long and slender ; anal plate peculiar, being broad and square, with 

 two lateral projections. Seven pairs of abdominal legs, the last pair short and 

 thick. Head pale greenish amber, with a broad black median straight band extend- 



