122 W. A. SANDS 



and $ imagos from type-colony, Congo: Brazzaville (/. Weiss), in Silvestri Coll., 

 Istituto di Entomologia Agraria, Portici, Naples. 



Other material. Guinea: Mount Nimba (M. Lamotte) in AMNH and BMNH. 

 Democratic Republic of Congo: Yangambi, 29. v. 1948, Camp Putnam, Epulu 

 R., v.1948 {A. E. Emerson) in AMNH. 



There is no biological information relating to the five known nest-series. 



Astratotermes prosenus sp. n. 



(Text-figs 278, 279, 284, 285 & 298-303; PL 2, fig. 5) 



Imago. Head capsule brown to sepia-brown, darker above ocelli, dark areas often extending 

 as tapering streaks converging to fontanelle; fontanelle fairly large, a little smaller than ocelli, 

 circular or slightly broader than long, sometimes irregular outline, flat or slightly depressed, 

 yellow-white to pale yellow-brown; medial spot circular, flat, smaller than fontanelle, brown; 

 postclypeus yellow-brown, labrum yellow; frontal marks weakly developed, flat crescent, 

 pale yellow-brown to brown; antennae yellow to pale yellow-brown. Pronotum, meso- and 

 metanota brown, transverse sutures distinct; femora yellow-brown, tibiae paler, tarsi yellow, 

 Abdominal tergites brown, dorsal stigmata and sternites, pale brown, sternites paler in middle, 

 ventral stigmata pale; cerci yellow. 



Posterior margin of head capsule usually evenly though somewhat broadly rounded; ocelli 

 medium-sized, separated from compound eyes by approximately own least diameter; post- 

 clypeus weakly to moderately inflated, Pcl/W, 0-23-0-27, posterior margin arched, median suture 

 distinct. Apical teeth of mandibles fairly long, La/Li, 0-68-0-78, Ra/Ri, 0-92-1-06; subsidiary 

 marginal tooth of left mandible separated from molar prominence by distinct notch in surface 

 view, complex ratio La/Li. L m , 6-34-8-90; points of apical and marginal teeth of right mandible 

 in line, anterior edge of first marginal slightly longer than that of second. Meso- and metanota 

 moderately wide at constriction, M/W, 0-32-0-35. Pilosity of head capsule yellow-brown, 

 rather sparse slightly uneven pelt with emergent setae. 



Measurements (six specimens from three localities) in millimetres. 



Range Mean ± S.D. 



Head width across eyes (VV) . 1-25-1-61 I- 394 ± °' r 35 



Ocellus (O w x Oi) . . . 009-0-13 x 0-11-0-19 0-106 ±0-014 x °' I 45 ± 0028 



Ocellus to eye (O-E) . . 0-09-0-13 0-104^0-014 



Postclypeus length (Pel) 

 Antennal article III . 

 Antennal article IV . 

 Antennal article V . 

 Left mandible, apical to first 



marginal (L A ) . . ■ 0-14-0-18 0-153 ± 0-016 



o-33-°-38 0-352 ± 0023 



0-04-008 0057 ± 001 1 



0-06-0-09 0-074 i 0-008 



0-07-0-09 0-075 ;£ 0-008 



Left mandible, first to third 



marginal (Lj) . . . 0-19-0-25 0-215 ± 0-026 



Left mandible, third marginal to 



molar (L m ) .... 0-09-0-1 1 0-094 ± 0007 



Right mandible, apical to first 



marginal (R A ) • • • 0-13-0-18 0-159 ± 0-019 



Right mandible, apical to first 



marginal (Ra) . • • 0-15-0-18 0-159 i 0-016 



