612 PROCEEDINGS OF THE NATIONAL MVSEUM. vol.57. 



with upper posterior ocellus a trifle above and lower posterior 

 ocellus a trifle below the upper anterior ocellus. Length of 

 basal, second and apical antennal joints proportioned as 2:1^:1; 

 supplementary joint small. Mandible with well-defined reti- 

 naculum and a slight elevation on the inner margin between reti- 

 naculum and end of mandible. Maxilla from end of cardo to end of 

 palpus somewhat longer than gula; length of basal, second and 

 apical joints of maxillary palpus proportioned as 1:1:1; palpiger 

 without chitinous plate. Stipes labii slightly chitinized ; labial pal- 

 pus with basal and apical joints proportioned as 1 : 1. Legs well de- 

 veloped. Abdomen with normally large intersegmental membranes, 

 j)Ostscutellar areas of medium size ; sternellar areas normal. Spiracles 

 annuliform without any trace of fingershaped tubes. 



TKICHODES ORNATUS Say. 



Hopkins U. S. No. 11930a; mature. Species reared; larval skin preserved. 

 (Figs. 8, 23, 36, 56, 73, 92, 105, 128.) 



Total length of body, 13 mm.; extreme width, 3 mm.; extreme 

 thickness, 2| mm. ; anterior width of prothorax, 2| mm. Mandibles, 

 epistoma, tip of cerci dark brown; remainder of head capsule, pro- 

 thoracic shield and other delicately chitinized parts pale cadmium 

 yellow; membranous parts salmon red. Setae thin, long, yellowish. 

 Frons hardly sculptured. Labrum more than twice as wide as 

 long. Mandible from apex to attachment of retractor tendon about 

 two-thirds the length of frons ; length to width as 9 to 8 ; apex does 

 not project over inner corner of mandibular basis; distance between 

 retinaculum and apex of mandible one-third the length of mandibu- 

 lar inner margin; elevation of inner margin between retinaculum 

 and apex slightly convex ; at least seven fine mandibular setae. Basal 

 plate of cerci poorly developed. Cerci upright, pointed, conical, 

 slightly curved, from end to attachment less than half as long as 

 frons. 



DIVISION II (pp. 613-614). 



Ocelli 4. 



9. Genus TARSOSTENUS Spinola. 



Body prolonged, vermiform with most of the segments of about 

 equal size; ninth abdominal segment semiglobular ; abdomen dor- 

 sally with ampullae on some of the posterior segments, ventrally 

 rounded with protuberant sternellar areas. Chitinous parts with 

 rather thin and light colored chitin. Membranous parts variegated. 

 Setae scarce and thin. Head capsule comparatively small, subtri- 

 angular. Frons slightly sculptured. Epicranium smooth above and 

 below; anterior margin of hypostoma with slight emargination. 

 Ocelli arranged in two, upward and backward directed rows behind 



