310 Mr. C. O. Waterhouse 07i the 



Polyctenes. It slioiild be observed, that altlioiigli the 

 presence of such distinct divisions between the segments 

 in the abdomen of Polyctenes gives it a somewhat different 

 appearance from most of the genera of HippoboscidcB, 

 some traces of the divisions are foimd in Leptoptena. 



As the Colombian insect does not agree with any known 

 genus, I propose a new genus for its reception. 



EUCTENODES. 



Without eyes. Head below, with a series of long spines 

 arranged like a comb along the posterior margin. Abdo- 

 men not divided into segments. Wings Avell developed. 



I think this genus may provisionally be placed in the 

 family PolyctnenidtB, that family being placed after the 

 Jlippoboscida, or at least near Strehla, with which genus 

 it most nearly agrees in the neuration of the wings. 



Euctcnodes inirahilis. 



Pitchy-testaceous, the head above rather darker than 

 the rest of the insect ; the legs testaceous. The head 

 above is beset with long, stiff bristles, Avhich are more 

 crowded together towards the posterior angles, with finer 

 hairs interspersed ; below, in front of the mouth cavity, 

 there are a number of short, sharp black spines, Avhich are 

 slightly bent and directed backwards ; in the middle there 

 is a narrow channel, which has posteriorly on each side 

 where it opens into the mouth cavity a small obtuse tuber- 

 cular projection. The posterior margin has a fringe of 

 long, nearly black, closely-set spines. The mouth cavity 

 is ovate ; on each side of it there is a longitudinal straight 

 ridge, and these two ridges are joined together at the 

 base by a third. In the middle of the cavity is a rhom- 

 boidal plate, which is possibly the base of the rostrum, 

 but I am unable to trace the rostrum itself; if present, it 

 is hidden in the anterior channel. 



Prothorax, Avith shorter, stiff hairs scattered over the 

 back and sides ; it is emarginate in the middle of the base. 

 The mesothorax appears as a scutellum, transverse, 

 rounded posteriorly, with some stiff hairs, four of Avhich 

 on the margin are very long. The wings are pale tes- 

 taceous, with yellow nervures. The prosternura is flat, 

 with a short ridge on each side anteriorly, and a mesial 

 irripressed line which extends the entire length and is 



