xxxiii, '22] ENTOMOLOGICAL NEWS 139 



Key to knoicn female EntiUuiimas of the pollutum f/roup. 



1. Black humeral stripe imt touching the lower end of the meso- 

 stigmal lamina, pale antehumeral stripe wider than the black 

 humeral, second lateral thoracic suture with a black stripe on its 

 uppermost fourth or fifth only vesperum 



Y. Black humeral stripe touching the lower end of the mesostigmal 

 lamina 2 



2(1'). Dorsum of segment 10 pale colored 3 



2'. Dorsum of segment 10 black; prothoracic dorsal pits small, each 

 with a small pale area anterior and adjacent to it 5 



3 (2). Prothoracic pits large, situated near the anterior border of 



the middle lobe, a pale area posterior and external to each. 

 Mesostigmal lamina black, a pale stripe from and including the 

 dorsal tubercle downward and forward across the lamina ; the 

 lower end^ of the lamina deeply indenting the mesinfraepisternum, 



s : gnatum 



3'. Prothoracic pits smaller, situated at or near the mid-length of the 

 middle lobe, pale color adjacent to each more extensive anterior to 

 it or to its level, rather than posterior to it . .4 



4 (3'). Mesostigmal lamina barely touching the mesinfraepisternum. 



Anterior end of the antehumeral pale stripe bordered with a 

 broad stripe of black on the mesostigmal lamina, which black 

 widely separates the antehumeral stripe from the pale vertical 



stripe on the lamina sulcatum 



4'. Mesostigmal lamina slightly but distinctly indenting the mesin- 

 fraepisternum. Antero-mesal end of the antehumeral pale stripe 

 very narrowly separated by black from the extensive pale area of 

 the mesostigmal lamina pollutum 



5 (2'). Prothoracic dorsal pits situated anterior to the middle of 



the middle lobe. Dorsal tubercle of the mesostigmal lamina pale 

 colored, from which a narrow pale stripe runs downward and 

 forward across the lamina ; posterior to this pale stripe the 

 lamina is broadly black, grooved, and with its lower end very 

 slightly indenting the mesinfraepisternum; the extensive black on 

 the lamina widely separates the lower end of the pale antehumeral 

 stripe from the pale stripe on the lamina, or, to express it in 

 possibly a better way, the dorsal and humeral black stripes are 

 broadly joined by a black bar across the mesostigmal lamina, 



pic tu in 



".'. Prothoracic dorsal pits situated at about mid-length of the middle 

 lobe. Dorsal tubercle of the mesostigmal lamina pale colored, 

 from which a pale line extends downward to or nearly to the 

 lower end of the lamina, the lower half of this pale line expanded 

 to cover the lamina to its anterior border; apparently the meso- 

 stigmal lamina, the ventral mesostigmal plate and the mcscpis- 



