WASP-GENUS PARALASTOR. 567 
P. smithi Sauss. I unfortunately failed to examine the type of 
this species, which is in the British Museum, and I cannot 
place it in my tables from the-description nor identify it 
with any of those described by me. 
P. hirtiventris Cameron. IhaveseenCameron’s ¢ type. Itisthe 
largest species of the genus, the tibie with long conspicuous 
hairs beneath. The second ventral segment is greatly raised 
behind the suleature, prominent at the top of the truncation 
medially, and clothed with long erect hairs all over, the 
following segments densely hairy. The thorax is all black, 
the 1st and 2nd abdominal segments with wide orange apical 
bands clothed very conspicuously with erect hairs. 
T have to thank the authorities of the British Museum for the 
loan of their specimens for description. Several of these bore 
type-labels of Saussure’s, but the species were not deseribed by 
him. I have, except in one instance, adopted the names applied 
by him to these species. Prof. E. B. Poulton very kindly sent 
me the whole of the Hope Museum collection of this genus. 
To Mr. Meade-Waldo I am particularly indebted for examining 
special structures in some of the British Museum type-specimens, 
which I had overlooked in the limited time at my disposal there, 
and for sending me descriptions of some others which I needed 
to complete this paper. 
In the following descriptions the measurements are always 
taken from the front of the head to the apical margin of the 
2nd abdominal segment. 
In my description of the 2nd ventral segment I use the adjec- 
tive “elevatus” as applied to the part which lies behind the 
transverse sulcus, because it is convenient and natural to reverse 
the insect in examining this segment. Of course in reality the 
segment is not raised, but produced downwards behind the 
sulcus. 
When a species is contained in more than one of the three 
collections examined by me, the actual type-specimen has always 
been selected from the British Museum Collection. 
The genus Paralastor may be divided into two main sections, 
one of which contains by far the greater number of species and 
exhibits by far the greater variety of structure. The species of 
the small division (the Divisio secunda of the following table) 
may be characterized as follows :— 
Species semper graciliformes ; segmentum primum abdominale 
conspicue parvum, nunquam fortissime transversum, sed sub- 
campanuliforme, secundo semper, basim versus, utrinque con- 
spicue angustato. Segmentum 2 dorsale basim versus fortissime 
convexum, ita ut semper (a latere visum) supra segmentum 
basale fortiter aut fortissime elevatum appareat; secundum 
ventrale, insecto resupinato, post suleum suum transversum 
semper supra partem suam basalem (sive presulcalem) fortissime 
