NOTES OX HYMENOPTERA. 61 



similar, but \vhen placed side by side the distinctions are 

 obvious. 



The British specimens of Myrmlca Kollari were taken 

 by Mr. J. Brewer at Sheerness in 1866. These specimens 

 I had lost, as I believed, but a few weeks ago they were 

 sent to me to name by Mr. Nicholas Cooke, to whom I 

 had sent them inadvertently when forwarding other in- 

 sects. Tetramorium Kollari is of the same size as the 

 common Leptothorax acervo7'U7n, and at first sight looks 

 very like it; but it has 4-jointed maxillary palpi ; Leptotho- 

 rax has them 5-jointed; in both the labial palpi are 3-jointed. 

 The most obvious distinctions, those indeed which will at 

 once serve to separate the species, are, first, the colour of 

 the head ; in L, acervorum it is black or dark brown, in 

 T. Kollari it is palish red, the same colour as the thorax. 

 Another distinction is, that the former insect has the head 

 very delicately striated longitudinally, whilst in the latter it 

 has a number of longitudinal carinse, between which it is 

 coarsely punctured ; the thorax is also rugosely punctured ; 

 the antennae are entirely pale, the club in L. acervoimvi is 

 blackish. 



This addition increases the number of our British ants to 

 thirty-three; for we regard JPheidole Icevigata and Mi/nnica 

 domestica, both species found in houses, as imported insects; 

 this will make the number of undoubted British ants thirty- 

 one. 



Cynips lignicola. — The male sex of this gall-fly has yet to 

 be discovered ; I had hoped to have announced it as a dis- 

 covery this season, having had the first chance of breeding 

 it that has ever occurred to me. 



It is generally known among entomologists, that the late 

 Mr. Benj. Walsh succeeded in obtaining males of an Ame- 

 rican species, Cynips spongijica ; specimens of both the sexes 



