184 



HYDIIOMKTRID.E. 



\y 



probably prove to be the same, when a longer series of specimens 

 can be compared. 1 have examined and compared the types o£ both 

 species. 



Genus CYLINDROSTETHUS. 



Hydrobates, Erichs. in Schomh. Faun. Brit. Guiana, p. 614 (1848), 

 nom. pperocc. 



Cylindrostethus, Fieb. Euro]). Hem. p. 33 (1861) ; Kirk. Entomolo- 

 gist, 1897, p. 258. 



Type, C. linearis, Erichs., a Neotropical species. 



Distribution. Neotropical and Oriental Regions. 



This genus may be easily recognized by tlie position and struc- 

 ture of the eyes, which are not exserted, but are long and placed 

 obliquely on the sides of the head ; the rostrum is also very short, 

 scarcely or only just reaching the anterior coxae. As Bergroth has 

 remarked in this genus, the metasternum apparently consists of 

 two segments, it being divided by a more or less distinct, trans- 

 verse, impressed line a little before the posterior margin. 



978. Cylindrostethus productus, 



(1840). 

 Cylindrostethus fieberi, Mayr, 

 (1865). 



iSpi7i. (Gerris) Ess. Hem. 

 Yerh. z.-b. Ges. Wien, xv, 



p. 64 

 p. 444 



Piceous-black 



Fig. 132. 

 Cylindrostethus producttti< 



Bombay {Dupont). 



disks of sternum aud abdomen, a central line 

 to head, broadest between eyes 

 and continued on anterior area 

 of pronotum, posterior margin 

 and sometimes also a narrow 

 central discal line to posterior 

 pronotal area, margins of con- 

 nexivum, and legs testaceous ; 

 antennse, apices of femora, an- 

 terior femora above and beneath, 

 bases of intermediate aud pos- 

 terior femora above, and apices of 

 tibiae, anterior tibite and tarsi and 

 posterior tarsi piceous ; a lateral 

 fascia on each side of body silvei'y- 

 grey ; antennae with the first joint 

 longer than the second and third 

 joints together, third shortest, 

 second and fourth subequal. 

 Length 25 millim. 

 HaJ). Travancore {Coll. Dist.). 

 Ceylon ; Ivandy {Green). 



979. Cylindrostethus scrutator, Kirk. (Gerris) liev. d'Ent. xviii, 

 p. 98 (1899). 



Dark olivaceous-black ; a small spot at base of head aud 

 posterior margin of pronotum ferruginous-brown ; hemelytra 



