598 The Philippine Journal of Science 1923 



ruga?, the median ones somewhat stronger; second cubital cell 

 twice as long on cubitus as on radius; first recurrent received 

 near apex of first cubital cell ; petiole shorter than hind femora, 

 slightly wider posteriorly; abdomen smooth and shining. Yel- 

 low; head except mandibles, flagellum except basal joints beneath, 

 a small spot in center of scutum, suture in front of scutellum, 

 inclosure of propodeum, prepectus, sternum, metapleuron, and 

 apex of petiole black; abdomen beyond petiole rufous; wings 

 hyaline ; venation pale brown ; head with silvery hair. 



Type locality. — Sandakan, Borneo. 



Described from one male received from C. F. Baker under 

 his number 16829. 



Type. — Catalogue No. 25042, United States National Museum. 

 Diodontus filicornis spi nov. 



Readily separated from its allies by the cylindrical joints of 

 the flagellum. 



Male. — Length, 7.5 millimeters. Anterior margin of clypeus 

 with two small teeth medianly ; transverse carina below antennas 

 strong and joining the equally strong frontal carina ; eyes con- 

 verging toward clypeus; frons and vertex shining; ocelli in a 

 low triangle, the anterior ocellus in a shallow depression; post- 

 ocellar line subequal with ocellocular line; antennae as long as 

 head and thorax, the joints cylindrical, not produced beneath, 

 third joint somewhat longer than fourth; anterior margin of 

 pronotum carinate, lateral anterior angles rounded; scutum 

 polished, but with a few distinct punctures; notauli wanting; 

 suture in front of scutellum finely foveolate; dorsal surface of 

 propodeum polished, basal area rectangular in outline and with 

 strong rugae ; median channel of propodeum deep ; posterior face 

 of propodeum coarsely reticulate; mesepisternum polished, the 

 suture not foveolate; petiole gently curved, cylindrical, subequal 

 with hind femur, well separated from rest of tergite ; first recur- 

 rent received by first cubital a short distance before apex ; second 

 recurrent gently bisinuate, received by third cubital cell a dis- 

 tance somewhat greater than half the length of second inter- 

 cubitus from its base; second cubital about one-third longer 

 below. Head and thorax black; mandibles (except apices) and 

 scape yellow ; flagellum brown, testaceous at base beneath ; dorsal 

 part of pronotum, scutum except three black elongate spots, 

 scutellum, metanotum, posterior face of propodeum (except 

 median furrow), two spots below anterior wing and one below 

 posterior wing yellow; base of petiole yellowish, apex black; 

 gaster rufous ; four anterior legs and posterior coxae yellowish ; 



