112 The Philippine Journal of Science ms 



strongly sinuate and contracted in the middle, being actually 

 broadly bisected by the very long sixth segment, which is ex- 

 tended forward to the apical margin of the second segment and 

 is three times longer in the middle than at the sides, apical 

 margin of sixth segment broadly and somewhat deeply sinuate, 

 genital segment rather large, broader than long, and less than 

 half the length of the sixth segment. 



Male. — Unknown. 



Luzon, Laguna, Mount Banahao. 



The four white transverse spots of the pronotal basal margin 

 are possibly more or less confluent in some specimens. 



This remarkable species in the structure of the female venter 

 is so different from the other species of which the female is 

 known to me, that its relationship to them at first sight seems 

 almost incredible. Yet the difference, although involving the 

 greatest part of the venter, is solely due to the excessive develop- 

 ment of the sixth segment, also found in some other genera of 

 the Heterogastrinse. Sadoletus vulvatns is unquestionably con- 

 generic with S. valdezi and hakeri, the stated sexual difference 

 notwithstanding, and some of the species of which only the male 

 is known to me may prove to be intermediate in the structure of 

 the female venter. 



Of the genus Sadoletus Dist. only two species from India and 

 one from Borneo were hitherto knowm. The occurrence of six 

 species on Mount Banahao alone is noteworthy and seems to 

 point to the Philippines as the headquarters of the genus, but 

 its species are apparently very rare; of five of the species here 

 described I have seen but a single specimen. 



To the generic characters of Sadoletus should be added : Head 

 beneath with a percurrent channel for reception of the first 

 rostral joint, second joint of antennse about double the length 

 of first, third shorter than the adjacent joints, fourth subequal 

 to or a little longer than second. Scutellum with the basal half 

 finely punctate, the apical half coarsely punctate with a median 

 keel sometimes extended forward beyond the middle. Corium 

 with the interstice between the two innermost rows of punctures 

 from before or near middle gradually widening to near apex, 

 then tapering to the apex, the row of punctures terminating the 

 interstice exteriorly being angularly bent a little before apex 

 and directed obliquely inward, meeting the interior row at the 

 apex, apical half of the interstice with a short row of punctures ; 

 clavus triseriately punctate, its commissure about one-fourth the 

 length of scutellum ; membrane with only three veins, the inner 

 and the outer veins arising from a common stem near the inner 



