September, 1908.] \Q% 



2. £ abdomen practically quid' red after the second segment. ? antennae black 

 (except the two small basal joints, which are red). Femora red (except, their 

 black bases). Upper half of stigma thickened and dark (opaque)... 



cingulatus, F. 



— cJ abdomen distinctly blackened at apex, and more or less streaked transversely 



with black on the intermediate segments. " antennas testaceous, at least up 

 to the base of the 4th joint. Femora black with their extreme apices whitish. 

 Stigma about equally translucent throughout, testaceous... 



xanthoceros, Steph. 



Thrinax, Konow. 



Iu this genus the 3rd auteunal joint is not as in Strongglogaster 

 and Stromboceros longer than the 4th, but either subequal to it or 

 shorter. In the $ $ the valves forming the saw-sheath have a singular 

 mucronate production at their apices ; and, in some species at least, 

 this makes the saw-sheath when viewed from above or below look 

 actually tridentate. 



Three British species certainly belong to Thrinax, and I believe 

 also a fourth, viz., Stronr/glogaster sharpi, Cam. The specimens of 

 the latter at South Kensington are in such a deploi"able state that 

 I have found it impossible to examine them satisfactorily, but at any 

 rate they do not belong either to Strongglogaster in Konow's sense or 

 to Stromboceros. They are certainly very small as compared with the 

 other Thrinax species, and their neuration is apparently identical with 

 that of Strongylogaster JiJicis ; but they are as unlike that insect as 

 possible in all other respects, and on the whole, judging from their 

 form, colour, and antennae, I can place them nowhere but iu the 

 present genus. 



In naming our British species I have as usual followed Konow, 

 ami given in brackets, where they differ, the names employed by 

 Mr. Cameron in the " Monograph." 



SYNOPTIC TABLE OF BRITISH THRINAX Spp. 



1. Lanceolate cell divided not far from the apex by a transverse almost perpen- 



dicular nervure. Very small species sharpi, C. 



— Lanceolate cell "open" without cross-nervurc. (Length, about 6— 8 mill.)... 2. 



2. " Antennae of $ shorter than body ; lateral mucronations at apex of the saw- 



sheath in the $? adjacent to each other" (see. Konow in W. E. Z., Jan., 



1885) contigua, Konow. 



(= mixtus, C. and Thorns., nee Klug). 



— <J antennae as long as the body, mucronations of ? s.s. divergent 3. 



3. Clypeus and labrum black. iMucronations of ? s s. only slightly divergent and 



very hairy. Femora of ? almost entirely black. Red of abdomen clearer, 



R 



