118 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



ductum. Hemelytra apicem abdominis nonnihil superantia, margine costali 

 et venis subtiliter et breviter radiato-puberulis, cellula discoidali clausa. 

 Abdomen lateribus nmbriatum. Pedes breviusculi, pilosi, femoribus anticis 

 modice incrassatis, latitudine saltern triplo longioribus, tibiis apice medio 

 femorum paullo angustioribus, femoribus posticis quam anticis paullo 

 angustioribus, margine toto superiore late levissime arcuato. Long. cT 

 5 — 5.5, cum hemelytris 5.5 — 6 mm. 



Groenoeng Oengaran (J.); Tengger Mts. (Fruhstorfer, my coll.). 



Allied to H. lombocensis Bredd. (of which I have the type before me), 

 but with laterally toothed anterior pronotal lobe and the legs shorter and 

 quite differently coloured. 



At Samarang Mr. Jacobson has found a Henicocephalus which is dis- 

 tinct from all the species enumerated above. It is doubtless the still 

 unnamed Javanese species of which Breddin (Mitt. Nat. Mus. Hamburg 

 XXII, p. 144) has described the larva, but the single specimen is so 

 mutilated that the species must remain undescribed until better preserved 

 material is at hand. 



I have also seen Javanese specimens of H. aëronauta Bergr., originally 

 described from the island of Laoet. 



The Henicocephalidae seem to be common in the tropics, but it is 

 only during the last twenty years, since the collectors began to devote 

 more attention to the smaller forms, that they have become commoner 

 in our museums. To judge from the experiences of some travelling natur- 

 alists these insects are best collected at sunset, when they gather in 

 great swarms, dancing high in the air like gnats, for which they no 

 doubt often have been mistaken. According to Gay they emit a strong 

 odour of musk. 



Fain. HYDROMETRTOAE. 



1. Hydrometra lineatus Eschsch., Entomogr. I, 110 (1822). 



Samarang (J.). 



There can be no doubt that H. vittatus Stal is identical with lineatus, 

 a species apparently overlooked by Stâl and omitted also in the Catalogue 

 of Lethierry and Severin. Eschscholtz's and Stâl's specimens were from 

 the Philippine Islands (Luzon), from where I also have examples and 

 where the species is common. Distant in his Indian Fauna cites the 

 Japanese H. albolineatus Scott and the Ceylonese H. Greeni Kirk, as 

 synonyms of vittatus, recording this species from Ceylon and different 

 localities in India and Burma, but he has probably confounded several 



