PPHR1DA. 



229 



broader than long, front margin widely emarginate, basal margin 

 sinuate, with a slight median lobe which in some species is not 

 prominent, sides straight at the base, then slightly bulging out 

 and abruptly curved in again ; anterior and posterior angles 

 acute in the type-species, but in some species they may be rounded ; 

 surface somewhat convex, obsoletely impressed in the type-species, 

 but in other species the impressions are more marked. Scutellum 

 somewhat broad, triangular with apex rounded. Elytra slightly 

 broader at base than prothorax, sides more or less nearly parallel, 

 in some species somewhat narrowed towards the apex ; each 

 elytron with eleven regular longitudinal rows of punctures, 

 including a scutellar and an extreme marginal row ; interstices 

 usually flat, except the last, i. e., that between the extreme 

 marginal row and the row next to it, which is broader than the 

 others ; in some species the other interstices are also somewhat 

 raised. Underside generally thinly covered with tine hairs ; legs 

 more or less robust ; front tibia feebly dilated at the apex and 

 ridged on the outer side ; middle tibia similarly ridged, a little 

 more dilated at the apex, where it is excavated, the sides of the 

 excavation being raised into a pointed angle at a little distance 

 from the apex ; hind femora strongly incrassate, oval, channelled 

 on the underside ; hind tibiae longer than the front or middle 

 tibiae, gradually dilated towards the extremity, ridged on either 

 side for three-quarters of their length, excavated on the last 

 quarter (measuring from the extremity), the borders of the excav- 

 ation densely lined with cilia-like hairs ; on the outer side the 

 excavation is raised into an angle at its commencement ; the 

 extremity of the tibia is truncate, the external lobe of the truncate 

 end simple, the internal lobe furnished with an acute spine, while 

 between the two lobes there is a bent spur ; tarsi robust, first 

 segment long and triangular, second very short, third twice as 

 broad, bilobed, fourth projecting beyond the bilobed segment and 

 terminated by bifid claws. 



The secondary sexual characters are similar to those stated 

 under the genus Podontia, i. e., in the male the first segment of 

 the anterior tarsus is dilated and convex and the last ventral 

 segment of the abdomen is notched on each side. 



Range. China, India, Sumatra, Malacca, Australia. 



Key to the Species. 



Body very hairy, with rows of silvery 



hairs along the longitudinal series of [p. 230. 



punctures on the elytra O. hirsuta, Stebbing, 



Body without hairs on the upper side . . 2. 

 Elytra chequered, irrorated or speckled 



with red-brown and dull yellow, the 



irrorations sometimes forming indis- [p. 231. 



tinct oblique bands on the elytra .... O. marmorea, Wied., 

 Elytra with yellow spots on a red- brown 

 background 3. 



