THE SOLDIERLESS TERMITES OF AFRICA 69 



Right mandible, first to second marginal 



(Ri) 0-07 



Right mandible, second marginal to molar 



(Rm) 0-0.5 



A . eumenus has been compared with the other members of species Group I under 

 their own descriptions and thus no further comment on A. amicus, A. benignus, 

 A. comis and A. concilians will be made. Its position in relation to other members 

 of the genus has also been discussed. Whether or not the worker abdomen is 

 dehiscent is uncertain in A. eumenus. 



Holotype $ imago, paratype $ and <$ imagos, and worker from type-colony, 

 Democratic Republic of Congo: Mukimbungu, 5°S., i4°E., ix.1909 (K. E. Laman), 

 in American Museum of Natural History. Paratype $ and £ imago from type- 

 colony also in BMNH. 



Only the type nest-series is known. There is no information on its biology. 



Group II 



Astalotermes aganus sp. n. 



(Text-figs 106, 107, 116, 117 & 126-131) 



Imago. Head capsule dark sepia-brown, slightly darker above ocelli; fontanelle distinct, 

 pale brown to brown, broad oval or nearly circular, distinctly depressed and roughened with 

 irregular transverse striations, only slightly smaller than ocelli; medial spot oval, brown to 

 sepia-brown, flat, slightly smaller than fontanelle; postclypeus sepia brown, labrum pale yellow- 

 brown; frontal marks distinct, semicircular, slightly to distinctly depressed, sepia-brown; 

 antennae, brown. Pronotum sepia-brown, meso- and metanota brown, transverse dark sutures 

 present in both; legs, femora brown, tibiae pale brown, tarsi yellow-white. Abdominal tergites 

 brown, dorsal stigmata sepia-brown, sternites brown, very pale in middle, ventral stigmata 

 brown; cerci pale brown. 



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

 pound eyes by up to one-third more than own least diameter; postclypeus moderately inflated, 

 Pcl/W, 0-25-0-26, Pcl/R A , 2-71-2-75, posterior margin evenly rounded, median suture distinct. 

 Apical teeth of mandibles fairly short, L A /Li, 0-65-0-66, R A /Ri, 0-89-0-91; subsidiary marginal 

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

 complex ratio L A /Li.L m , 7-47-8-83; points of apical and marginal teeth of right mandible in 

 line, anterior edge of first marginal distinctly longer than that of second. Pilosity of head 

 capsule pale brown, uneven, no pelt. Meso- and metanota somewhat wider at constriction, 

 M/W, 0-27-0-32. Fore tibia with third apical spur distinct. 



Measurements (two specimens from one locality) in millimetres. 



Head width across eyes (\V) . . 1-06-1-14 

 Ocellus (O w xO|) . . . 0-08 x o-io 

 Ocellus to eye (O-E) . . . 009-010 

 Postclypeus length (Pel) . . 0-28-0-29 

 Antennal article III . . . 0-03-0-04 

 Antennal article IV . 0-05-0-06 

 Antennal article V 0-05-0-06 

 Left mandible, apical to first mar- 

 ginal (L A ) .... o-io-o-n 



