118 Dr. Sharp's Revision of the 



two and three of about equal length, four to ten differ- 

 ing little from one another in length, but each one a 

 little stouter than its predecessor, the first of them 

 longer than broad, the last of them scarcely so long 

 as broad ; eleventh joint half as long again as the 

 tenth. Palpi testaceous. Head broad, rounded, a little 

 narrower than the thorax, closely and finely punctured, 

 the vertex flattened in the male. Thorax a little narrower 

 than the elytra, about one-third broader than long, 

 scarcely at all narrowed behind ; its disc flat, with an in- 

 distinct impression in the middle in front of the base, 

 closely and finely punctured. The elytra are yellowish, 

 about one-third longer than the thorax, their length not 

 quite so great as their breadth, their punctuation dense 

 and fine. The margins of the segments of the abdomen 

 are brownish, and the extremity is lighter in colour ; 

 segments two to four are pretty thickly and finely punc- 

 tured ; fifth segment sparingly punctured ; sixth nearly 

 impunctate. The legs are yellow, rather robust. 



In the male, the upper plate of the seventh abdominal 

 segment has the hind margin emarginate in the middle, 

 while the under plate is very much produced, and turned 

 upwards ; the sides of the produced part are not evenly 

 rounded, but suddenly narrowed in the middle ; the ex- 

 treme apex is narrow, and emarginate. 



In the female, the upper plate of the seventh segment 

 is obsoletely emarginate at the apex, while the under 

 plate is not produced, and the posterior margin is gently 

 rounded. 



Generally distributed, and not uncommon in damp 

 places, on the banks of rivers, &c., in both England and 

 Scotland. 



Ohs. — This species is allied to H. elongatula, but is 

 readily distinguished by its broader, more robust form, 

 more transverse thorax, and the extraordinary structure 

 of the seventh segment of the abdomen in the male. 



21. Homalota londinensis . 



Linearis, nigra, antennarum basi elytris pedibus 

 anoque rufo-testaceis, confertim subtiliter punctata ; an- 

 tennis sat tenuibus, articulo penultimo leviter transverso ; 

 capite medio canalicula brevi; thorace subquadrato. 



