134 



25 (24) Scutclluni with a few excessively short hairs on mar- 

 g-in, which are hardly visible; abdomen with dense 

 fuscous tomentuni on the dorsum over a large part 

 of the surface. 

 25a (25b) Posterior tibiae dark except at extreme base; abdo- 

 men with the second and following seg-ments black 

 at the base, and with rather indistinct pale apical 

 'bands, narrowed or interrupted at the middle. //(o;;a^. 

 25b (25a) Posterior tibiae entirely pale or partly infuscate; ab- 

 domen with dark fuscous tomentum, not banded 

 above. 

 25c (25d) Posterior tibiae almost uniformly yeWowlsh.. kocbclci. 

 25d (25c) Posterior tibiae more or less infuscate in parts . JicUuo. 



Wings with the third costal segment much longer 

 than the fourth, sometimes twice as long. 



Whole body nearly uniformly covered with cinereous 

 tomentum cinerascens. 



Body not so clothed; more or less variegated with 

 black and grey or whitish tomentum. 



Tarsal joints black above liylaciis. 



Tarsal joints pale, except the api'cal joint. 



Larger and robust species (length over 4 nmi.) apical 

 margin of scutellum fringed with some longish and 

 very distinct hairs. 



Hypopygium with a thin outstanding rounded 

 lamella falla.r. 



Hypopygium with an elongate, dull area marked out, 

 'but no strong lamella dolichostigmus. 



Smaller species (length under 4 mm.) apical margin 

 of the scutellum with only a. few very short fine 

 hairs, easilv overlooked. 



Hypopygium with a thin lamella strongly outstand- 

 ing laincUifcr. 



Hypopygium with an elongate channel or impression, 

 but without a strong lemella comitans. 



Antennae with the third joint not sharply pointed at 

 apex, nor acuminately produced. 



Abdomen except towards the 'base entirely shining, 

 somewhat aeneous, and not variegated with tomen- 

 tum crypsiobalcus. 



39 (38) Abdomen more or less variegated with pale and dark 

 bands or spots. 



