32 O. M. Eeutek et B. Poppius. 



Female. Black, slender, smooth, sliining, setose. Head, rostrum, fore border of the 

 prothorax, scutellum, propectus, abdomen beneath at the tip and on each side ofthe base and 

 legs red. Head elongate-conical, as long as the fore lobe of the prothorax. Antennae black, 

 setose, longer than the head and the prothorax together; first joint red, a little less than 

 half as long as the head; second more than twice as long as the first; third shorter than the 

 second; fourth a little longer than the third. Fore lobe of the prothorax about twice as long 

 as the hind lobe. Fore femora incrassated, with a black streak beneath; fore tibiae clavate. 

 Membrane with a red discal patch, which is connected with the basal hue. Length of the 

 body 3 3/4 lines. 



a. Amazon Region. From M. Bates' collection." 



Prostemma ruficeps Walk., Cat. Hem. Het. Biit. Mus. VII, p. 185 (1873). 



Genus IV. Dacnister Scott. 



„Head viewed from above, exclusive of the eyes, elongate, somewhat hexagonal, the 

 part in front of the eyes longer than from the anterior margin of the latter to the base. Eyes 

 moderate. Antennae, 1st joint shortest, reaching to about one-half its length before the ante- 

 rior margin of the head; 2nd clavate, about one-half longer than the 1st; 3rd longest; 4th 

 equal to the 2nd. Rostrum long; 1st joint stout, about as broad as long; 2:nd elongate, at 

 least 2 1/4 times as long as the Ist; 3rd e(jual to the 2nd. Thorax. — Pronotum somewhat 

 long, flattish convex lougitudinally, as long as or slightly longer than the breadth measured 

 on the posterior margin; lateral margins almost straight, gradually widening to the posterior 

 angles; anterior margin straight; posterior margin very slightly concave. Elytra. — Membrane 

 (apparently) without cell-hooks. Legs. — Thighs, 1st pair thick, upper margin convex, lower 

 margin with a stout tooth in the middle; 2nd and 3rd pair simple. Tibiae, 1st pair conside- 

 rably dilated before the apex, then tapering towards the latter; extremities of the dilation 

 somewhat flat on the sides, and produced into a short tooth; inner margin concave, with two 

 rows of minute serrations; 2nd and 3rd pairs simple. Tarsi, 1st and 2nd pairs equal in 

 length, 3rd longest. 



Somewhat resembling the genus Metastemma, Serv., in shape and some of its charac- 

 ters, and in others to that of Alloeorhyncus, Fieb., to which it is most nearly allied. The 

 eyes, however, are not so prominent as in the last named, and the 2nd pair of thighs are 

 simple on the under side. Like Alloeorhyncus it is very diminutive in stature." 



Dacnister, Trans. Ent. Soc. 1880, p. 315; Leth. et Sév., Cat. gén. Hém. III, p. 402; 

 OsHAN., Verz. pal. Hem. I, 2, p. 567. 



I. Dacnister flavescens Scott. 



„Buff, with a dull velvety appearance. Head black, anterior margin brownish yellow. 

 Antennae, 1st joint projecting about half its length before the anterior margin of the head; 

 2nd clavate, black, about one-half longer than the 1st; 3rd longest; 4th equal to the 2nd. 

 Rostrum, 1st joint stout, about as long as broad; 2nd and 3rd elongate, about equal in 

 length. Pronotum bufl', anterior margin straight, posterior slightly concave, lateral margins 

 widening gradually to the posterior angles. Scutellum black. Corium, anterior margin with 

 a border of short, fine, pale hairs; dise with a triangulär diaphanous white patch. Membrane 

 fuscous-brown, narrowly margined with yellowish white. Thighs, Ist pair incrassated, upper 



Tom. XXXVII. 



