6 THE VOYAGE OF H.M.S. CHALLENGER. 



" 2. //. sericeus. — Corpore ovali, subtus argenteo, supra albo-cinereo ; oculis flavis. 



Long, ir. 



"Escli. ebencla p. 164. 79. tab. 2. fig. 4.— Laport. Hem., pp. 24. 4. 



" Ziemlicli hiiufig auf clem nordlichen stillen Meere in tier Nahe des Aequators. 



" 3. //. Jlaviventris. — Corpore cylindrico, subtus argenteo, supra albo ; abdomine 

 niaculisque duabus pectoris apicalibus flavis. 



" Esch. ebenda 165. 80. tab. 2. fig. 5. 



" Auf dem siidlichen atlantischen Ozean." 



[Dr. Burmeister follows Eschscholtz in ascribing two joints to the hind tarsus. He is 

 also mistaken in thinking that the relative lengths given by him of the joints of the middle 

 tarsus are generic characters. They, in fact, difi"er in the various species. ^F. B. W.] 



IV. — Robert TEMPLETOisr, R.A. 



Description of a new Hemiisterous Insect from the Atlantic Ocean. Transactions of the Ento- 

 moloijical Society of London, vol. i. p. 230, 1836. 



" Hydrometrid^, Leach. 



" Genus Gerris, Latr. 



" Sub-genus Halohates, Eschscholtz (Entomographien). 



" Sp. H. Streatfieldana, pi. xxii. fig. A. 



" Broadly ovate, or lozenge-shaped, brilliant black ; eyes, two minute spots near 

 the prothorax, and the sides and apices of the first uncovered pair of 

 abdominal annuli (4th and 5th) rufous ; beneath brownish-black, the first 

 five abdominal rings yellowish with rufous apices, offering the appearance of 

 five narrow transverse fasciae ; last rings broad and rufous black. Apterous. 

 "Length, O'lS inch. 



" Found on the Atlantic Ocean, in longitude 20° under the line. 



" This beautiful species was captured nearly midway between the continents of 

 Africa and America, by Colonel Streatfield, 87th R.T.F., whose name I have in conse- 

 quence done myself the favour to affix to it, as being most appropriate, and as a slight 

 testimony of the grateful recollection I have of his kindness in presenting me with many 

 interesting species of insects and other rarities. The sea was quite smooth, with a gentle 

 swell, at the time the insect was caught ; a number were swimming about among the 

 Porpitse, which formed the first object of attraction, and fortunately directed attention to 

 the insect. The singularity of its distance from any land, and the possibility of its being 

 driven off" from the African coast by the south-eastern gales, gave full play to conjecture, 

 and excited our attention to the little creatures in the water, in the hope of ascertaining 

 on what objects it preyed ; but all possibility of discovering this was quickly put a period 



