102 Memoirs of the Indian Museum. [Vol. VII,. 



unpunctured ; the lateral ones are strongly punctured. In other respects this species 

 resembles M . australiensis. 



Mastochilus (Cetejus) grabowskii (Kuwert). 



Fig. XIII, 5. p. 99. 

 Ceteris grabowskii, Kuweit, 1898. p. 330. 



Three specimens from Humboldt Bay, New Guinea. 1 Length 28-5-29-0 mm. A stouter 

 insect than M. australiensis or ill. puberilis, with shorter antennal lamellae. 



The mandibles are not angulate externally, and there is no denticle exposed on the 

 upper margin behind the rudimentary upper tooth. The upper surface of the head resembles 

 that of M. puberilis, except that the outer tubercles are more outwardly directed, that the 

 central and inner tubercles are more widely separated, and that the frontal ridges are more 

 or less incomplete between them. The secondary scars on the mentum are represented by 

 a more or less broken transverse groove a little behind the anterior margin. The scars 

 anterior angles, and marginal grooves of the pronotum are coarsely punctured ; the median 

 groove is very strong. All the grooves of the elytra are somewhat coarsely punctured. 



Mastochilus (Cetejus) sodalis (Kaup). 



Aceraius sodalis, Kaup. I8680. pp. 29-30 : and 18686, p. 5. 



A number of specimens from Ternate and Batjan, one of the latter being from Labuan ; 

 also one from Taruna, Gt. Sangir, 2,000 ft. Length 24-0-25-8 mm. 



This species closely resembles the last, but is smaller and therefore less perceptibly 

 asymmetrical; it has a somewhat shorter frontal area, and has the groove formed by the 

 secondary scars on the mentum deep and unbroken. 



Mastochilus (Cetejus) peltostictus (Kaup). 



Fig. XIII, 6, p. 99 ; also pi. I. 

 Aceraius pelt osi ictus, Kaup. 18686, pp. 5-6. 



Two specimens from Ceram and many from New Guinea, one of the latter being from 

 Stephansort. Length 22-5-26-3. 



The outer tubercles are strongly asymmetrical, the left one being slightly longer than 

 the right, broad and truncate instead of slender and pointed, and more inwardly directed. 

 The groove representing the secondary scars on the mentum is more strongly arched away 

 from the anterior margin than in 31. sodalis, and the grooves of the elytra are more finely 

 punctured, especially the dorsal ones. In other respects 31. peltostictus resembles 31. 

 sodalis. 



1 The two specimens which I recorded from Stephansort (1914c, p. 334), though compared with named specimens in- 

 Berlin, do not agree with Kuwert's description of the present species, and are apparently M. peltostictus, Kaup. 



