184 W. A. SANDS 



Right mandible, first to second marginal 



(Ri) 014 



Right mandible, second marginal to 



molar (R m ) ..... 008 



All of the necessary comparisons of A . tranquillus have already been made in the 

 discussions on the other species. As indicated in the generic discussion, the enteric 

 valve armature of the workers forms a sequence, and apart from an un-named 

 species known only from the workers and illustrated in PI. 4, A. tranquillus represents 

 the most primitive form. 



A lectotype is designated from the existing syntype material as indicated below. 



Type-material. Anoplotermes tranquillus Silvestri, LECTOTYPE $ imago, 

 paralectotype queen, <$ imago and three workers from type-colony, Guinea: Mamou, 

 io°2o'N., I2°I5'W., 26.viii.1912 (F. Silvestri), in Silvestri Coll., Istituto di Ento- 

 mologia Agraria, Portici, Naples; other paralectotypes in AMNH. 



Only the type-series is known. 



ANAOROTERMES gen. n. 



(An — 'without', aoros, Gr., 'weapon') 

 Type-species: Anaorotermes echinocolon sp. n. 



Imago. Large sized, W, 111-113. Fore tibia with three apical spurs, third well developed. 

 Apical teeth of mandibles short, La/Li, 0-49-0-51, Ra/Ri, 0-75-0-81; subsidiary marginal 

 tooth of left mandible with proximal end clear of molar prominence in surface view, complex 

 ratio, La/Li. L m , 6-55-7-10; points of apical and marginal teeth of right mandible approxi- 

 mately in line, anterior edges of first and second marginals equal. Meso- and metanota moder- 

 ately wide at constriction, M/W, 0-31, transverse dark sutures present; complex ratio of mandible 

 and notal measurements, Li/M.N, 1-41-1-55. 



Worker. Large sized, W, o-88. Fore tibia slender, T"i/T w , 5-89, with thee apical spurs, 

 third smaller than other two but not vestigial. Apical teeth of mandibles short, La/L], 0-53, 

 Ra/Ri, o-8o; subsidiary marginal tooth of left mandible with proximal end just clear of molar 

 prominence in surface view, complex ratio, La/Li. L m , io-6o; point of first marginal tooth of 

 right mandible slightly behind line of apical to second marginal, anterior edge of first marginal 

 slightly shorter than that of second, complex ratio, Ra/Ri. Rm, 1590. Mesenteric junction 

 with proctodeum overlapping, length about twice width of mesenteron at insertion of mal- 

 pighian tubules, just to right of malpighian knot. Enteric valve seating with two rather 

 prominent outer lobes and a smaller inner lobe, attached to very muscular second pouch of 

 proctodeum by short neck, dorsolateral in position in unopened abdomen; internal cushions 

 of enteric valve different in every position, position 1 vestigial, retracted, unsclerotized, arma- 

 ture at most one or two minute scales or teeth on inner face; position 2, produced slightly 

 through valve opening as one or two elongated sclerotized spines, rest of armature a few minute 

 spines on unsclerotized part of cushion; position 3, distal end of cushion sclerotized, hemi- 

 spherical, everted through valve opening, and covered with about 35 stout elongated curved 

 spines, rest of cushion unsclerotized, with many small spines; position 4, produced through 

 valve opening, distal end sclerotized with rake-like row of 7-8 elongated outwardly curved 

 spines, rest of cushion unsclerotized, with many small spines. 



The enteric valve armature of Anaorotermes is almost as bizarre as some of the 

 genus Ateuchotermes, and may serve a similar function, though this is achieved in 

 a different manner. The larger bilateral development of position 3 recalls Alysco- 



