370 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



19. Black locust saw-kly. 

 Nematus robini(v Forbes. 



From a number of saw-fly larvte found infesting the black locust 

 {Bobinia pseudacacia) at Normal, we bred during the latter part of 

 July a small saw-fly related to Nematus bivittatus and aureopectus, 

 but apparently undescribed. The larva from which this specimen 

 was bred entered the ground July 8, emerging on the 26th. (Forbes^ 

 Third Rep. Ins. Illinois.) 



Adult. — Body stout, pale brownish yellow ; mesothorax with a black vitta upon 

 each side ; nietathorax with a transverse black band continuous with the posterior 

 extremities of the mesothoracic stripes ; tergum blackish, with the sides and pos- 

 terior margins of the segments of the general color; prothorax between the ends of 

 the mesothoracic stripes a little darker brown ; head slightly darker than the body, 

 with a quadrate black spot upon the occiput, extending forward to include the 

 ocelli. This area is slightly shining, but the adjacent surfaces of the head are dull, 

 punctured, and rather densely pubescent. Antennie longer than the head and body, 

 third and fourth joints equal; clypeus emarginate in front. The under parts and 

 legs are uniform pale yellow brown, except the tibiae and tarsi of the posterior pair, 

 which are dusky, and the genital valves of the female, which are black. Wings 

 hyaline, veins fuscous, costa and stigmata yellowish, second submarginal cell slightly 

 angled at the recurrent nervules, of which there are two about equally removed 

 from the two extremities of the cell. First submarginal quadrate, distinct ; pos- 

 terior margin of wing behind the lanceolate cell slightly tinged with yellowish. 

 Length of body, 4""" ; expanse, 10™'". Described from a single female. (Forbes.) 



20. Parthenos nubilis Hubner. 



Dr. Harris has raised the moth from the caterpillar which in Sep- 

 tember is found hiding itself in holes of the trunk of the locust, going 

 out at night to eat the leaves ; the pupa was found in a loose web on 

 the surface of the ground ; the moth appeared June 1 8. 



Larva. — First pair of abdominal legs rather smaller than the others, and rarely 

 used in creeping or resting. Color, brown above, finely dotted and variegated with 

 dark brown ; body beneath pale brown, with a black spot between the prologs, and 

 a blackish streak beneath the last three segments. Two zigzag brown lines (almost 

 black posteriorly) form a series of lozenges along the back, one lozenge being on 

 each segment, aud becoming gradually narrow behind. Each lozenge, especially 

 those of the hinder segments, has a black spot near the hind angle. A pale line on 

 each side below, and contiguous to the spiracles, and in young specimens a dark- 

 brown line above the spiracles. The latter are black. Head round, dark brown, but 

 spotted with pale poiuts in clusters. Top of first segment marked with a semi-circular, 

 darker, but not horny spot. Legs pale brown as the belly. (Harris Corr., 320.) 



Moth. — Head rather small, thorax dark ashen, a black line in front, strongly tufted 

 behind ; abdomen dark gray above, lighter below, strongly keeled dorsally ; fore- 

 wings pointed, deeply scalloped outwardly, much rounded ; color dark ashen ; basal 

 and transverse anterior lines distinct, geminate ; transverse posterior line obsolete; 

 beyond, a submarginal line, slender, much angulated ; a blackish, somewhat trian- 

 gular apical dash present ; reniform spot large, bounded on each side by a light band, 

 starting from the costa, the outer reaching to the outer third, the inner parallel, 

 reaching to the inner margin ; these are often nearly white, and coalesce behind the 

 reniform spot ; subreniform obsolete; hind wings bright yellow, with two median 

 black bands, irregularly waved, parallel; discal lunule within strongly marked; 

 marginal band toothed on both sides ; fringe yellowish. Expands 50 to 70""°. 

 Occurs throughout the Eastern States and in Colorado. (Hulst.) 



