130 On Subaquatic Insects. 



mento vix angustius, apice profundi emarginato et ciliato. Palpi 

 labiales lshio vix longiores 3-articulati, articulis magnitudine sensim 

 decrescentibus. (Fig. 1, d.) 



Species unica. 



Micralymma Johnstonis, Westw. (Plate IV. Fig. 1.) 



Tota nigra, subpubescens, baud nitida, sublaevis. 



Long. corp. 1^ lin. 



Habitat in arenosis ad littora prope villain " Berwick-upon- 

 Tweed" dictam. 



In honorem Dominae Johnstonis, rerum naturalium pictoris ele- 

 gantissimaeuxoris Domini G. Johnstonis, et rerum maritimarum ob- 

 scurarum naturae scrutatoris eximii, indefessique. 



This insect is most nearly allied to the genera Anthobium, Oma- 

 lium and Coryphium. From all these, however, it is at once distin- 

 guished by the minute size of the elytra. In Anthobium, moreover, 

 the body is broad and ovate ; inOmalium the body is also much shorter 

 and broader than in this insect ; whilst in Coryphium the head is 

 much broader than the thorax, and the palpi clavate. The tropin 

 are not very different from those of Coprophilus (Elonium, Leach.) 



In company with these insects were found specimens of the co- 

 leopterous larvae and pupae from which the accompanying sketches 

 (Fig. 2 and 3) have been taken. The former (Fig. 2) is very long 

 and narrrow, with an oblong flat head, armed with acute sickle- 

 shaped jaws (Fig. 2, »?.,) having a single very strong external tooth 

 about the middle of the interior margin. The maxillae are repre- 

 sented by an elongated stem supporting two articulated lobes, the 

 exterior four-articulated, the two basal joints very thick, and the 

 two terminal joints slender, and the interior two-jointed, the joints 

 of nearly equal length (Fig. 2, mx) : the lower lip and its appen- 

 dages (instrumenta labialia) are represented by a square basal joint 

 supporting two thick detached cylindrical scapes, each terminated 

 by a slender two-jointed palpus (Fig. 2, l.) The antennae (Fig. 2, 

 A) are four-jointed, the first, second, and fourth joints of nearly 

 equal length, the third twice as long, and irregularly shaped, hav- 

 ing a lateral appendage. These organs, as well as the different parts 

 of the mouth, are furnished with long curved hairs. Eyes — ? Protho- 

 rax larger than the following joints, which are nearly equal in size, 

 except the terminal one, which is smaller, and terminated by a cy- 

 lindrical proleg, having on each side a slender two-articulated 

 and setose filament. The legs (Fig. 2, b) consist of three pairs, at- 

 tached in pairs to the three anterior segments of the body. Length 

 of the larva a line and three-quarters. 



