190 ^^"'"**' 



base iind dark apex : ss. never with its extreme apex sharply acumi- 

 nate (viewed laterally) '"^• 



29 (28) Hind tibite and tarsi never noticeably dilated, apex of J abd. beneath 



(= 8th ventral plate), never emarginate, but somewhat triangularly 



produced in the middle, ? ss. always normal 30. 



Uind tibiaj and tarsi (except in one genus) evidently more or less dilated. 



In that genus the ventral apex of <? ahd. is more or less distinctly 

 emarginate, and the ? s.s. are phenomenally long and broad (viewed 

 from beneath) ^ ' 



30 (29) Mesonotum and pleura3 shining, not closely punctured : ant. long and 



slender: face nearly round ; ss. usually rather short and slender... 



Fteronus. 



Mesonotum and pleura; duller, more closely punctured : ant. shorter and 



stouter ; face more triangular ; ss. stouter (the stigma too is long, and 

 sharply pointed at its apex) Amauronematus. 



31 (29) Hind tibiee and tarsi paradoxically dilated (almost scutate!) ... Croesuf. 

 Hind tibia; and tarsi simple ; or if dilated, moderately so only 32. 



32 (31) Hind tibiee and tarsi evidently though not extravagantly dilated, and the 



former also Bulcate longitudinally Eolconeme. 



Hind tibiffi and tarsi simple. The ss. ( ? ) enormous, occupying quite 



half the ventral side of tlie abd. (must be viewed from below). The 

 3rd cubital cell usually rather elongate and parallel-sided. The stigma 

 often dark at base and light at apex. The <? 8th ventral plate evi- 

 dently emarginate at apex Nematus. 



33 (27) Pentagonal area on head above well defined : antennse setiform and (in 



the S at least) fairly long. (Species not exceedingly small. Colours 



• „„•, Fachynematus. 



various) ^ 



Pentagonal area not definite. Short filiform antennae. (Extremely small 



black species, with dark unicolorous stigma and short simple ss.)... 



Micronematus. 



34 (25) Pentagonal a. fairly definite. <? dorsal apex of abd. shows a produced 



(projecting) carina. ? ««• (seen from above) normal, the lobes which 

 compose it not gaping widely asunder. Claws always with subapical 



tooth LygcBonematus. 



Pentagonal a. indistinct (sculpture of head above altogether shallow and 



inconspicuous, except that it may be strongly punctured) : $ dorsal 

 apex carinated, but the carina not projecting : ? ss. with divergent 

 hairy lateral lobes, often conspicuous (from above), claws sometimes, 

 thoJgh rarely, bifid Pristipkora. 



35 (19) Both the medial mi. strike the same cubital cell (the 2nd). The 1st 



medial n. never runs towards the apexoi the stigma, but often towards 

 its base or a point before it. The gena; are long, i. e., the eyes are 



remote from the mandibles 36. 



Either— the two medial nn. strike upon different cubital cells : or— the 



1st medial h. runs towards the apex of the stigma: or-the eyes 

 closely approach the mandibles (" gen® breves ") 37. 



36 (35) Humeral a. contracted Hemiohroa. 



