British Species of Ilomalota. 105 



Mas; abdomine segmento 7° ventrali paulo elongate, 

 apice rotundato. 



Fern. ; abdomine segmento 7° ventrali apice medio 

 leviter emarginato. 



H.fragilis, Kr. Stet. Ent. Zeit. xv. 125 ; Ins. Deutsch. 

 ii. 223 ; Wat. Cat. 



Var. — Thorace medio late impresso. 



Black, with the elytra pitchy-black, and the legs tes- 

 taceous ; antenna pitchy, slender, not thickened towards 

 the apex, the length of each joint greater than its 

 breadth ; second and third joints of about equal length ; 

 four to ten differing but little from one another in length, 

 eleventh about a third longer than the tenth. The head 

 is a little narrower than the thorax, nearly square, with 

 a distinct channel, or fovea ; thickly and finely punc- 

 tured. Thorax somewhat narrower than the elytra, its 

 length nearly as great as its breadth, a little narrowed 

 behind, thickly and very finely punctured, with a channel 

 along the middle, beginning from an obscure impression 

 behind. The elytra are slightly paler in colour than the 

 head and thorax, fully one-third longer than the latter, 

 densely and very finely punctured. The abdomen is 

 black, its punctuation not so fine or dense as that of the 

 fore parts ; segments two to five are thickly and finely 

 punctured ; sixth segment more sparingly punctured 

 than the fifth. 



In the male, the under plate of the seventh abdominal 

 segment is a little more produced than the upper plate, 

 and has its posterior margin rounded. In the female, 

 the seventh under plate is gently eixiarginate in the 

 middle. 



This species is very abundant on the banks of the 

 rivei's and streams everywhere in Scotland. 



A variety occurs in which the thorax has a broad long- 

 itudinal impression along the middle ; some examples are 

 also darker in colour tha.n the type, and have the legs 

 nearly black. 



10. Ilomalota longula. 



Depressa, nigra, confertissime subtilissimeque punc- 

 tata, antennis tenuibus, apicem versus haud incrassatis, 

 fuscis, pedibus piceo-testaceis ; capite quadrate, obsolete 

 impresso; thorace subquadrato, canaliculate, basin versus 



