88 Claude Fuller 



cutting edge of the mandibles is developed according to the scries 

 to which they belong. The images exhibit varying wing lengths 

 and may be placed into two main series in accordance with 

 whether the colour of the anterior margin of the head, laterad of 

 the clypeus, is brown or black, or they may be arranged in 

 three main, but more or less intergrading, series in accordance 

 with the width of the incurvature of the middle anterior region 

 of the fourth sternite, the incurvature being four times v^der in 

 some series than others. 



Having considered all these points of separation together vrith 

 certain varying features found in examining cleared preparations 

 of the imago head and minor differences noticed in the dentation 

 of imago and worker mandibles, so complex a position has been 

 arrived at that I have for the present abandoned any idea of 

 erecting a series of *' forms ** and I propose to treat the species 

 only in the wide sense. 



Notwithstanding the minor differences here alluded to as 

 tending to characterize series of " species in the making " from 

 different localities, the winged imago of T, angustatus s.lat. stands 

 well apart from its congeners and is readily recognisable. 



Winged Imago : Moderately large ; dark black brown with dark 

 brown wings; somewhat sordid pale legs and creamy white con- 

 junctiva. Head below cream coloured ; above black brown except 

 antennse, antennal fossa?, clypeus and mouth parts. Antennae 

 pale brown or brown, antennal fossae pallid or yellowish, clypeus 

 brown margined with yellow brown and with a relatively wide 

 median stripe of yellow brown; (very often the anterior margin 

 of the head laterad of clypeus more or less concolorous there- 

 with) ; epistome white; labrum and bases of mandibles some- 

 what sordid yellow brown. Thorax and tergites of abdomen 

 concolorous with head or with the anterior regions of the meso- 

 and metanotum dark brown, not black brown. The T mark and 

 spots of the anterior lateral corners well defined in cleared pre- 

 parations of pronotum, otherwise invisible or but dimly outlined. 

 Sternites of abdomen dark brown, not black brown, tending to 

 be somewhat paler but never yellowish in the middle; second 

 and third sternites with triangular white spots; sixth sternite 

 of female with a short yellow patch at extremity ; eighth sternite 

 of male distinctly yellow in the middle area and around the 

 abdominal papillae. 



Legs, (seen from below) ; coxae parti-coloured, inner surfaces 

 pallid yellow-brown, outer surfaces dark brown ; femora pallid 

 or sordid cream coloured, tibiae dark brown fading to yellow 

 brown at tip, (in the males, the brown is of greater extent than 



