800 MR. E. A. ELLIOTT ON THE 



DiASTEPHANUS Enderl. 

 Enderlein (2), p. 473. 



This subgenus, as defined by Enderlein, has the , lowest form of 

 neuration, consisting of three basal cells and a widely open i-adial 

 cell ; the median nervure rarely extends beyond the transverse 

 nervure, and then only as a short stump, whereas in Fcenato2nis 

 it extends to the full length of an outer submedial cell, or closely 

 approximating that length. It occui'S in the Ethiopian, Oriental, 

 and Australian Regions, but has not yet been recorded from the 

 Western Continent. 



The species vary in size from 6 to 29 mm. in length, and the 

 colour is, on the whole, brighter and more varied than in the 

 other subfamilies ; a white or flavous frons with rufescent lines 

 is A^ery common. 



In preparing a table of species, I have experienced much diffi- 

 culty in consequence of the want of details in some descriptions, 

 in which, for instance, such important points as the sculpture of 

 the head and the pi-oportional length of the basal antennal joints 

 are omitted. The colour of the terebral sheaths forms a good 

 distinction in many cases, but these being broken in one species, 

 renders it useless in that section. The colour of the terebra must 

 always be understood to refer to the sheaths ; the spicula is 

 usually rufescent. 



Table of Species. 



?. 

 (20.) 1. Hind femora tridentate. 



(11.) 2. Petiole as Ions as rest of abdomen. 

 (6.) 3. Hind femoral teeth white. 



(5.) 4. Femoral teeth milk-white ; frons arcuate striate, mesonotum 

 and median segment coriaceous and diffusely i^unctate ; 

 terebral sheaths red-brown, with broad subapical yellow 



band 1. 7eitcoc?o?i Kieff. 



(4.) 5. Femoral teeth whitish ; frons finely rugose, mesonotum 

 coarsely irregularly rugose-punctate, median segment 



cribrate punctate, terebral sheaths black 2. pallescens Schlett. 



(3.) 6. Hind femoral teeth not all white. 



(8.) 7. Posterior margin of head produced into a collar; femoral 



teeth brown, median segment alutaceous 3. fiiscideus Kieff. 



(7.) 8. Posterior margin of head bordered, but not collar-like. 

 (10.) 9. Sheaths of terebra black ; neck short ; hind femora punctate, 



the teeth black 4. biroi Szepl. 



(9.) 10. Sheaths of terebra white-banded: neck elongate; hind femora 



trans- striate, central tooth white 5. hilineatus Elliott. 



(2.) 11. Petiole distinctly longer or shorter than rest of abdomen. 

 (17.) 12. Petiole distinctly shorter than rest of abdomen. 

 (14.) 13. Body unusually slender, pronotum elongate and shining, 



frons denselj-^ striate 6. gracilis Kieff. 



(18.) 14. Body normal, prothorax not elongate, more or less dull. 



(16.) 15. Head finely reticulate, posterior margin simple... 7. tertianusM.or\eY. 



(15.) 16. Head rugose, posterior margin bordered 8. nova-giiineensis 



(12.) 17. Petiole distinctly longer than rest of abdomen. [Szepl. 



