BY ARTHUR M. LEA, F.E.3. 



347 



smaller, whilst the punctures, both on the head and pro- 

 thorax, are usually larger and denser; approaching the 

 female type. An increase in size of mandibles is often 

 accompanied by an increase in the numbers or size of 

 tibial teeth. The cusps often vary in number and size 

 on the different sides of a specimen. 



The labrum is subject to variation, especially as re- 

 gards its median prominence; its apparent shape also is 

 affected by the opening or closing of the mandibles, and 

 it is frecjuently partly obscured by grease, dust, and mud. 

 Its clothing and the clothing beneath it also frequently 

 afreet its appearance, so that whilst at first it appears to 

 be a very satisfactory character, in reality it is of very 

 little use for distinguishing species. 



The hind angles of the prothorax appear to be subject 

 to but slight variation within the limits of a species. 



The mandibles of the females, although different to a 

 slight extent, inter se, are so much alike that they are 

 practically useless for purposes of identification. 



Two curious specimens were before me. One (see 

 figure 42) was an hermaphrodite specimen of punctatus, 

 having the left side male and right female. The other 

 was a variety of curvicornis, having seven legs, the extra 

 one jutting out from the left front coxa. They have been 

 sent for incorporation in the teratological collection of 

 the British IMuseum. 



I have to thank ^Messrs. Aug. Simson and H. J. Carter 

 for allowing me to see all their specimens of the genus; 

 but in particular ]\Ir. Jas. A. Kershaw, who sent for ex- 

 amination not only those of the National ]\Iuseum, but 

 also those of the Howitt collection, and as Professor 

 Westwood received several of his types from Dr. Howitt, 

 these were particularly welcome. 



LISSOTES CURVICORNIS, Boisd. 

 A'ar. subtuberculatus, Westw. opacus, Deyr. 



The original description of curvicornis is quite use- 

 less, and Parry's remarks (i) are of little use to the 



(i) Trans, Ent. Soc, 1870, p. 64. 



