no SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



terior margin of caudal notch about three-fourths greatest width of 

 segment. Dorsum convex, sloping downward from front to back. 

 Dorsal plate (dpla) irregularly lined and wrinkled; sparsely punctu- 

 late; impressions indefinite, usual lateral pair practically obliterated 

 by submarginal depressions; 2 faint paramedian impressions (pirn) 

 converge posteriorly, almost meeting ; without setae except at lateral 

 margins, which are raised and carinate, bearing 2 prominent blunt 

 setiferous teeth (to) and i or 2 smaller teeth farther anterad and 

 slightly more ventrad; transverse impression (trim) continuing com- 

 pletely across segment. Tergite continues uninterruptedly laterally 

 and on posterior ventral surface; with from 15 to 18 setae on each 

 side, some issuing from small sclerotized tubercles ; distance between 

 anterior margin of caudal notch and posterior margin of pleural area 

 approximates one-fifth of total length of segment (exclusive of uro- 

 gomphi). Pleural area transversely striate. Sternum of 2 sclerites, 

 each with 5 setae. 



Urogomphi (ur, fig. 22, d) large, separate, bifid, finely punctulate 

 dorsally; projecting caudad; prongs unequal. Inner prong (ipr) 

 large, projecting backward and slightly upward, terminating bluntly 

 rounded; i prominent seta on ventrolateral aspect halfway along 

 prong, issuing from a deep socket with raised anterior margin; 2 

 setae ventrally. Outer prong (opr) just a small round knob much 

 like the blunt "teeth" on sides of dorsal plate ; projecting dorsocaudad ; 

 I long seta issuing from apex and i short, fine seta from mesal aspect 

 of base. Undivided part of urogomphus with 2 long setae, i ven- 

 trally and I just laterad to base of outer prong. 



Caudal notch (en) large, U-shaped, longer than wide. 



Tenth abdominal segment with whorl of 10 fine setae and a few 

 shorter hairs scattered over surface ; anal aperture linear and median. 



Material used in study. — The only larva available to the writer was 

 received through the courtesy of Dr. Fritz van Emden, of the British 

 Museum, London, in whose private collection it is stored. This larva 

 was labeled "Hypnoidus pidchellus L. or Selatosomus bipustulatus 

 L. ?" However, Dr. van Emden kindly compared the illustrations 

 prepared from this specimen with a larva and a larval skin (associated 

 with an adult of Corymbites bipustulatus reared by C. O. Waterhouse) 

 that he later found in the Museum collection. He states, "There can 

 be no doubt whatever that this larval skin is conspecific with my larva, 

 which you have figured." 



