218 W. A. SANDS 



brown crescents; antennae yellow. Pronotum brown, meso- and metanota yellow-brown, 

 transverse sutures present, weak in some specimens; femora and tibiae yellow, tarsi paler. 

 Abdominal tergites brown, dorsal stigmata sometimes slightly darker, lateral parts of sternites 

 and ventral stigmata brown, sternites yellow in middle; cerci pale yellow. 



Posterior margin of head capsule evenly rounded; ocelli rather small, separated from com- 

 pound eyes by one-third, up to four-fifths own least diameter; postclypeus weakly to moderately 

 inflated, Pcl/W, 0-23-0-31, posterior margin arched or slightly bowed, not evenly rounded, 

 median suture usually distinct. Apical teeth of mandibles short, La/Li, 0-42-0-57, R A /Ri, 

 0-63-0-74; subsidiary marginal tooth of left mandible just clear of molar prominence in surface 

 view, complex ratio, La/Li. Lm, 8-00-9-30; apical and marginal teeth of right mandible approxi- 

 mately in line, anterior edges of first and second marginal teeth equal in length, complex ratio, 

 Ri/Ra-Riti (note difference from ratio used in worker caste), 21-7-29-9. Pilosity of head capsule 

 pale yellow, a short fine pelt with emergent setae in most specimens, less even in some. 



Measurements (10 specimens from six localities) in millimetres. 



Range Mean ± S.D. 



Head width across eyes (W) . 0-69-0-79 °'745 ± 0030 

 Ocellus (O w x Oi) . . . 006 008 x 0-08-0-10 0066 ± 0-007 x 0-087 -j_ 0-009 



Ocellus to eye (O-E) . . 002-005 0041 ± 0008 



Postclypeus length (Pel) . 0-17-0-24 0196 ± °° 2 5 



Antennal article III . . 001-003 0021 ± 0-006 



Antennal article IV . . 0-03-0-05 0036 ± 0-006 



Antennal article V . . 003-004 0036 4j; 0-006 

 Left mandible, apical to first 



marginal (L A ) • • . 005-007 0060 i 0-007 

 Left mandible, first to third 



marginal (Li) . . . 0-10-0-13 0124 ± 0-005 

 Left mandible, third marginal 



to molar (L m ) . . . 005-006 0055 ± 0-006 

 Right mandible, apical to first 



marginal (R A ) • • • 006-007 0-063 ± 0-005 

 Right mandible, first to second 



marginal (Ri) . . . 0-09-0- 10 0092 ± 0005 

 Right mandible, second mar- 

 ginal to molar (R m ) • • 005-006 0056 ± 0004 

 Mesonotum width (M) . . 0-16-0-20 OI 73 db o-ou 

 Metanotum width (N) . . 0-16-0-20 0175 ± 0-014 



Worker. Head capsule pale yellow, pilosity sparse, yellow. Postclypeus moderately to 

 strongly inflated, Pcl/W, 0-28-0-35, Pcl/Ri, 2-30-3-02. Apical teeth of mandibles short, 

 La/Li, 0-50-0-60, Ra/Ri, 0-68-0-80; subsidiary marginal tooth of left mandible separated from 

 molar prominence by distinct notch in surface view, complex ratio, LA/Li.L m , 12-52-14-60; 

 point of first marginal tooth of right mandible distinctly behind line of apical to second marginal, 

 anterior edge of first marginal distinctly shorter than that of second, R A /Ri.R m , 16-60-18-30. 

 Fore tibia moderately swollen, Ti/T w , 3-58-4-05, third apical spur small, but not vestigial, 

 about one-quarter length of other two. Mesenteric overlap with proctodeum from four to five 

 and a half times as long as width of mesenteron at insertion of malpighian tubules; enteric 

 valve seating very weakly two-lobed, connected to second pouch of proctodeum by a very 

 short neck, lateral in position in unopened abdomen; internal cushions of enteric valve in 

 positions 1 and 2 retracted, very small, with scaly surface on at most one or two small spines; 

 position 3 produced through valve opening, cylindrical, tapering distally and armed with 10-15 

 elongated pectinate spines around the edge, and other prominent spines on the posterior ends 

 of scales on the proximal part of the cushion; position 4 retracted, similar in size to position 2, 



