ON SOME HYMENOPTEROUS INSECTS FROM THE ISLAND 



OF FORMOSA. 



By S. A. RoHWER, 

 Of the Bureau of Entomology, Department of Agriculture, Washington, D. C. 



The following is a list of the Tenthredinoidea, the Vespoidea, and 

 the Sphecoidea belonging to a collection made by Mr. T. Fukai of 

 Konosu, Saitama, Japan, and sent to the United States National 

 Museum. The species were all collected at Horisha, Formosa, 

 between April 20 and May 15, 1909. With the exception of the 

 tenthredinoid genus Athlophorus Burmeister all of the genera are 

 cosmopolitan. 



Superfamily TENTHREDINOIDEA Ashmead. 

 Family TENTHREDINID.E. 



ATHLOPHORUS FORMOSACOLA, new species. 



Apparently nearest to Athlophorus scurrilis (Konow), but differs 

 from that species in a number of ways. 



Male. — Length 9 mm. Anterior margin of the labrum rounded; 

 anterior margin of the clypeus arcuately emarginate, the angles acute; 

 front with close, distinct punctures; vertex and posterior orbits 

 shining, hardly punctured; middle fovea very shallow; ocellar basin 

 very small, enclosing the ocellus above but not below; postocellar 

 furrow wanting; postocellar area sharply defined laterally, the ceplial- 

 caudal length about half as long again as the width; ocelli in an 

 equilateral triangle; antennae thickened near the middle, the apical 

 four joints ridged beneath; dorsulum with distinct, separate punc- 

 tures; scutellum elevated in the middle into a strong sharp ridge; 

 legs and venation normal; stigma slightly broadened apically; 

 hypopygidium rounded at the apex ; gentaha stipes rounded apically, 

 broader basally. Black; labrum, clypeus, mandibles (except the 

 piceous apices), scape, a narrow line surrounding the orbit (slightly 

 interrupted above), line on posterior margin of pronotum, spot on 

 propleuras, two lines above the intermediate cox£e, narrow line on 

 dorsal segments two and four, apical segments above and below, 



Proceedings U. S. National Museum, Vol. 39— No. 1794. 



477 



