ASTACOPS. 3 



by him as differential characters, all subsequent students and 

 workers have followed and employed his divisions. Many of the 

 genera possess most distinctive faeies, but afford few good 

 structural characters that can be used in a differential diagnosis. 

 In small insects of a soft structure this difficulty is frequently 

 found. 



Synojms of Genera. 



A. Eyes stylated Astacops, p. 3. 



B. Eyes not stylated. 



a. Base of prouotum sinuate, posterior angles 



a little posteriorly produced Oncopeltits, p. 4. 



b. Base of pronotum straight, posterior angles 



not produced. 



a. Head not tumid behind eyes, which touch, 



or nearly touch, anterior margin of 

 pronotum. 

 a'. Metapleurfe posteriorly straight or 

 somewhat roundly truncate, posterior 

 margin not oblique. Orifices black . LyCt^its, p, 5. 

 b'. Metapleiu'fe posteriorly obliquely trun- 

 cate. Orifices red or pale coloured. 

 «'". Head either totally, or mostly, red 



or pale coloured*. [p. 14. 



a^. Rostrum long; orifices black .. Pyrrhobaphus, 

 b'\ Rostrum of moderate length ; [p. 8. 



orifices red or flavescent Graptostethus, 



b^. Head either totally or almost black. [p. 11, 



a*. Orifices black, body sericeous. . Aspilocoryphus, 

 b^. Orifices red or pale, body pilose. Lygjeosoma, p. 13. 

 c'. Metapleurse posteriorly externally 



strongly produced Melanotelus, p. 12. 



b. Head tumid behind eyes, which are well 



separated from anterior margin of pro- 

 notum. 

 a'. Second and fourth joints of antennte 

 subequal, or fourth shorter than 



second Arocatus, p. 1.5, 



b'. Fourth joint of antenuEe distinctly 



longer than second C^xocoris, p, 16. 



Genus ASTACOPS. 



Astacops, Boisd. Toy. AstroL, Ent. ii, p, 637 (1835) ; Stdl, En. Hem 

 iv, p. 98 (1874). 



Type, A. australis, Boisd., from New Gruinea. 



Distribution. Malay Archipelago and Australasia. A species 

 now described from British India. 



Eyes stylated ; ocelli much nearer to each other than to eyes ; 

 scutellum not tumescent, but distinctly carinate ; lateral margins 



* In Pyrrhohaphiis leucurus a variety occurs in which the head is wholly or 

 nearly black. 



b2 



