ART. 2 LARVAE AND PUPAE OF TH E FAMILY LEPTIDAE GEEENE 5 



the posterior spiracles (fig. h) ; these spiracles are yellowish brown, 

 nearly circular, with a broad flat peritreme which is divided into 

 about 32 equal parts, nearly rectangular and separated from each 

 other by very fine grooves ; inside of the peritreme is a large depressed 

 area with a roughly granular surface and in the center of this de- 

 pression is a dark brown, small, smooth, circular area. 



Length, 9 mm. ; width, 2 mm. ; thickness, 1.4 mm. 



Arlington Farm, Va. Larvae and pupae from Rohinia poda- 

 grica^ reared March 12, 1906, by A. D. Hopkins. Hopk. U. S. No. 

 6062. 



Pupa {-fig. 1). — Very thin, shining, transparent, with a yellowish 

 tinge. Antennal capsules large, pointing outward, faintly annu- 

 lated to the tip; just posterior to the base of these are three faint 

 ocellar punctures. Thorax slightly longer than wide, smooth ; wing 

 pads smooth, reaching to the apex of the third abdominal segment; 

 thoracic spiracle (fig. c) situated on a small elevation; the spiracular 

 entrance is golden yellow, sinuous, and contains a great number of 

 short radiating slits. Abdomen cylindrical, composed of eight seg- 

 ments; first and last segment without any spines; segments 2 to 7 

 with a transverse, dorsal row of reddish yellow spines just posterior 

 to the middle of the segment; segments 1 to 7 have a spiracle 

 (fig. d) on the antero-lateral surface; spiracle small, golden yellow, 

 slightly elevated ; last segment rounded at apex and entirely smooth. 



Length, 6 mm. ; diameter of thorax, 1.85 mm. ; diameter of ab- 

 domen, 1.75 mm. 



RHACHICERUS NITIDUS Johnson 2 



Plates 1 and 2 



Habits. — Larvae are predacious, and were found in the decaj'ed 

 trunks of sycamore trees which were lying on the ground. 



Larva {jig. 2). — Small, ivory white, cylindrical; head elongated, 

 jDointed, dark yellowish red, heavily chitinized, with three pairs of 

 bristles, one pair near the apex, one pair near the middle, and one 

 pair near the base; there are 11 segments in addition to the head; 

 segments from 1 to 5 short and of equal length; segments 6 to 11 

 a little longer than the preceding segments and of equal length; 

 encircling each segmental line is a row of small, round yellow spots. 

 Anterior spiracle (fig. e) is located posteriorly on the side of the first 

 segment; it is nearly elliptical, reddish yellow, and around the 

 edge shining; the middle is depressed and granular, and at the an- 

 terior end of the depression are six small elongated tubercles point- 

 ing backward. On the dorsum of segment 1 is a small triangle 



- It is of interest to notice tlie diffeipnce in the texture of the chitin in the closely 

 allied genrea Rh-aohicerus and Xylophagus. 



