396 



GERALD F. HILL. 



Thorax moderately flattened above, rounded, slightly bent up and emarginate 

 in front, rounded on the sides, narrowed to the slightly emarginated posterior border, 

 divided medially by a suture, two clear transverse impressions behind the upturned 

 anterior margin. I.egs slender ; tibial spurs, 3:2:2. 



Wing-stumps triangular, suture straight, margin ciliate except at base of 

 posterior border, scattered hairs over entire surface of membrane. In the fore- 

 wing (fig. 28) the median vein branches from the radius within the wing-stump ; 

 in the hind-wing the branch is distinctly beyond the cross suture ; radius very dark, 

 darker than other veins, shaded above and below beyond the middle ; median 

 nearer the cubitus than the radius, dark at the base only, unbranched or with a 

 variable number of indistinct branches near the apex ; if branched, the branches 

 joining the wing margin at or above the apex ; cubitus with 9-12 branches, the 

 first 4-8 dark and often branched, the remainder lighter, simple or branched once 

 or twice, all reaching the posterior margin. 



Fig. 28. Lencotermes clarki, sp. n., wings of imago. 



Abdomen elongate, very little widened in the middle, bluntty rounded at apex ; 

 sternites 1-7 with clear spot at each end ; cerci short, basal portion as long as apical. 



Measurements : Total length, about 7 ; head, with jaws, 0-99-1 • 17 long ; thorax 

 and abdomen, 5-57 long ; head, at and including eyes, 1 -2 wide ; antennae, 1 -7 ; 

 mandibles, right, 0-61 long, 0-43 wide, left, 0-66 long, 0-37 wide; prothorax, 0-6 long, 

 0-99 wide; fore-wing, 12-5 long, 3-66 wide; hind-wing, 11-5 long, 3-8 wide; 

 tibia (i) 0-89, (ii) 0-89, (iii) 1-17; abdomen, 1-64 wide. 



Soldier. — Head bright yellow, palest behind ; mandibles dark ferruginous to 

 bright yellow ; labrum and antennae bright yellow ; pro-, meso- and metathorax 

 pale yellow, like back of head, remainder of insect whitish. Head, margin of thoracic 

 tergites, and abdomen with scattered, moderately strong, reddish hairs. 



Head (fi.g. 29) long, parallel on the sides, rounded behind. Mandibles long, 

 moderately stout, of typical form. Labrum long and wide (0-47 long, from anterior 

 margin of clypeus, by 0-35 wide across the middle), slightly swollen on the sides, 

 narrowed to the pointed apex. Anteclypeus very short, hardly visible. Post- 

 clypeus nearly twice as wide as long, truncate in front. Fontanelle present. 

 Maxillary palpi with first and second joints half as long as third and fourth ; fifth 

 slightly shorter than fourth. Antennae 16- or 17-jointed ; in 16- jointed antennae, 

 1st joint stout, twice as long as 2nd ; 3rd shorter and narrower than 4th, shortest ; 

 4th as long as 2nd, swollen ; 5th shorter than 4th ; 6th as long as 4th ; 7th longer: 



