108 SMYNTHUEUS. 



ovoide ; une taclie noire, triangulaire sur le front : clos 

 vert bleuatre ; dernier article des filets caudaux, court, 

 ovalaire ; tubercules sous-abdominaux tres saillants. 

 Long f ou 1 millim. Sur les plantes aquatiques. 



I have also found tliis species on the surface of 

 ponds in Kent. 



Smyntlmirus luteus, Lubbock. 



Sviynthurus liiteiis, Lubbock, Trans. Linn. Soc, 1867. 



Plate III. 



Yellow ; eyes on a black patch ; apical portion of 

 antennas violet. 



The females, which are decidedly larger than the 

 males, are about ^ of an inch in length. Very 

 common, among grass, from May to July. 



In colour and in habits this species closely resembles 

 the S. lujmlincB, of Bourlet ; the eyes, however, are 

 situated on a black patch. My S. aureus agrees with 

 S. luteus in the possession of the black patch, but 

 differs in the form of the caudal lamellae, of the feet, 

 and of the antennge. 



The four segments of the antennsG increase in length 

 from the base to the apex, each being nearly twice as 

 long as the preceding : the proportions are 8, 15, 24, 45. 

 The terminal portion consists of about twelve seg- 

 ments more or less closely soldered together and each 

 bearing a whorl of hairs ; the four central segments 

 are more distinctly marked than those on either side of 

 them. At the extremity of the organ are some rod- 

 like hairs. 



Though the males are smaller than the females, their 

 antennae are not only relatively, but absolutely longer. 

 In form, however, there is no material difference 

 between the sexes. 



The onandibles are strong, but the terminal teeth, 

 excepting the last of all, project very slightly. The 



