ADDENDA 335 



if it should prove to be new to science. I am not awai'e that tlie paper 

 has yet appeared. Tlie male is at once distinguished by the form of thei 

 fedeagus, which differs from that of all the other species of the group, 

 and it has the claws of the anterior tarsi practically equal in length, 

 which separates it from ruficollis, fulvicollis, icehnckei, and immamlatus. 

 One easily seen character also distinguishes it from all the other species 

 of the group, and that is the shape of the basal segment of the median 

 tarsi. This has a very noticeable curve VN'hen viewed laterally, and gives 

 the impression of a portion having been neatly taken out of the inner 

 mai'giu. Mr. Balfour Browne believes that the female has the inter- 

 strial spaces of the elytra finely punctured throughout, as desciibed by 

 Edwards in the female of //. ruficollis, De G. 



The species is found in England, Scotland, and Ireland, in lakes and 

 canals, and large drains of clear water. 



HYDROPHILID^. 



Laccobius, Er. Mr. J. Edwards (Ent. Mo. Mag. xlviii. (2 Ser. 

 xxiii.) 1912, p. 210) gives a useful table for the sepai\ation of the species 

 of this difficult genus by the "goggles " or specula on the front of the 

 labrum, a character first noticed by Dr. Sharp (v. p. 20) : we append the 

 table as far as it concerns the specula. 



I. Specula present, 



i. Specula sub-circular. 



L. NIC4RICEPS, Thorns, (simiatus Fowler nee. Mots.). 

 L. puRPURAscEJsS, Newbery, L. ytynensis, Sharp. 

 ii. Specula wider than long. 



1. Specula about twice as wide as long. 



L. siNUATUs, 3fots. (phlongus, Gorh.). L. regularis, Rei/. 

 (scutellaris, Sharjj nee. Mots.). 



2. Specula about four times as Avide as long. 

 L. ALUTACEUS, Thoms. 



II. Specula absent. 



L. MINUTUS, L., L. BIGUTTATUS, Germ, {hipunctatus, Fowler 



nee. Fab.) 



STAPHYLINID.ffi. 



Homalota (Hydrosmecta) muiri. Sharp. Depressed, black, with 

 the tibia} externally, and the tarsi, of a dirty testaceous colour, extremely 

 thickly punctured and with thick and yet almost imperceptible pubes- 

 cence ; antennfe slender, with the apical joint slightly thicker ; head 

 subquadrate, thorax not transverse, slightly narrowed behind. The 

 insect may be separated from its close allies by its blacker colour, the 

 excessive minuteness of its dense pubescence, and the slight thickening 

 of the outer joints of the antennas. L. 2J-2J mm. 



