76 The Philippine Journal of Science ms 



reaching base of head, subequal to or slightly shorter than first 

 antennal joint, second subequal to first, third shorter than second 

 but longer than fourth. Pronotum strongly narrowed from 

 base to apex, at the base one-half broader than head, transversely 

 bluntly impressed a little before the middle, where it is some- 

 what constricted, lateral margins vertically obtusely rounded, 

 basal margin almost straight, posterior lobe rather strongly 

 declivous, anterior lobe a little less so, one-third narrower than 

 posterior lobe, moderately convex with little-rounded lateral 

 margins, collar narrow. Scutellum longer than broad, a little 

 convex. Metasternum with acute posterior angles. Elytra a 

 little longer than abdomen, clavus with three, often somewhat 

 irregular or confused and partly abbreviated, rows of punc- 

 tures, its commissure more than half the length of the scutellum, 

 apical margin of corium straight, somewhat shorter than the 

 claval suture, membrane with four, in the basal half somewhat 

 curved veins. Legs long and slender, front femora a little 

 incrassate in the basal half, gradually narrowing toward apex, 

 beneath with a row of rigid setse arising from very minute 

 granules, tibise straight, the middle and hind pair set with slender 

 bristlelike spines, first joint of hind tarsi somewhat variable, at 

 least two, but sometimes nearly three, times longer than the 

 other joints united. 



This genus is allied to the Indo-Malayan genera Ve7tomanniLS 

 Dist., Omacrus Bergr., and Porta Dist. and forms with them 

 a distinct group in the division Myodocharia, characterized 

 by the elongate, slightly incrassated front femora. Apart from 

 other important characters, Tachytatus differs from Vertoman- 

 nus in the very much shorter postocular part of the head, from 

 the two other genera in the unarmed humeral angles of the 

 pronotum. 



Type of the genus, Tachytatus prolixicornis sp. nov. 



Tachytatus prolixicornis sp. nov. 



Black with a leaden bloom, basal half of posterior pronotal 

 lobe, an oval, submedian, scutellar spot, an oval, subapical, claval 

 spot, and posterior half of corium velvet-black without a paler 

 bloom, corium with a transverse luteous dot near inner apical 

 angle, and somewhat before outer apical angle with a quadran- 

 gular or posterointeriorly rounded white costal spot almost 

 reaching the apical margin, membrane fuscous, a large trian- 

 gular interior basal area black, extreme outer basal angle and 

 apex whitish; extreme basal margin of pronotum usually ob- 

 scurely testaceous, extreme apex of scutellum and posterior 



