REPORT ON THE PELAGIC HEMIPTERA. 



39 



DESCEIPTION OF THE SPECIES. 



The number of species of Halohates (in tlie restricted sense) already described is 

 five, viz. : — 



Halohates micans, Esch. 

 „ sericeus, Esch. 

 „ Jlaviventris, Esch. 

 „ streatfieldanus, Tempi. 

 „ wiillerstorffi, Frauenf. 

 To these I am able to add six, namely : — 



Halohates pnnceps. Halohates germanus. 



„ hay anus. „ sobrinus. 



„ proavus. „ frauenfeldanus. 



Key to the Species.i 



1 The last three joints of the antennse of equal length, . . . frauenfeldanus. 

 The last three joints not all of equal length, ..... 2 



2 Front femora more or less distinctly steel-blue in colour, .... 3 

 Front femora not blue, ........ 4 



3 Antennas with the second and third joints equally long, .... micans. 

 Antennas with the second joint one-fourth longer than the third joint, . loullerstorffi. 



4 Front tarsus with the first joint nearly twice as long as the second joint, . princeps. 

 Front tarsus with the first joint never more than equal in length to the second joint, 5 



5 Antennse with second joint equal to, or a little longer than, the fourth joint, . 6 

 Antennas with the second joint distinctly shorter than the fourth joint, . . 8 



6 Front tarsus with the first joint almost as long as the second, . . Jlaviventris. 

 Front tarsus with the first joint distinctly shorter than the second joint, . . 7 



7 Front tarsus with the first joint oue-half shorter than the second joint ; antennae 



with the second and fourth joints subequal in length, . . . hayanvs 



Front tarsus with the first joint one-third shorter than the second ; antennae with 



the second joint rather longer than the fourth joint, . . . proavus. 



8 Front tarsus with the joints subequal in length, .... streatfieldanus. 

 Front tarsus with the first joint shorter than the second joint, ... 9 



9 Middle tarsus with the first joint seven times longer than the second joint, . serieeus. 

 Middle tarsus with the first joint not more than five times longer than the second joint, 10 



10 Base of autenme narrowly rufous ochreous ; front tarsus with first joint a little 



more than half the length of the second joint, . . . germanus. 



Base of antennae concolourous ; front tarsus joint about one-fourth shorter than the 



second joint, ........ sobrinus. 



' The " key " must be used with cautioi: More than one or two points have to be taken into consideration in dis- 

 criminating the more closely allied species. 



