60 
fore better to substitute the term prescutellum, since this is evidently 
what Emery intended. In the region just referred to, two sclerites pas 
(parascutellum) are sometimes marked off one on either side of the 
scutellum. Many insects show traces of these sclerites. 5) The large, 
usually triangular region s (scutellum) which is well defined in most 
Neuroptera, Hymenoptera, Hemiptera, etc. 6) A narrow, transverse, 
posterior, marginal region pot (pos ttergite) which is usually represented 
by a backward-projecting fold, or “reduplication” of the anterior plate 
ssl, in the Orthoptera (the “posterior reduplication” of Snodgrass, 
1908). It is a large well marked sclerite in the saw-flies, and is incor- 
rectly designated as the “postscutellum” im these insects (Marlatt, 
1896). 
The posterior plate psi, or postscutellum, usually consists of an 
external region bearing an internal phragma. The writer (Crampton, 
1909) formerly distinguished the external region as the “phragmite” 
and the internal one as the phragma. The external region (“phragmite”) 
in such insects as the Tipulidae, is divided into a median region mt, and 
two lateral regions pl? on either side of the median region. The median 
region was termed the mediophragmite (mi) and the two lateral 
regions (plt) were termed the pleurophragmites (anterior and pos- 
terior). Mr. Martin, in a paper about to be published, proposes to 
modify these terms to me ditergite and pleurotergite — a suggestion 
which has much to recommend it, since the latter terms are more 
euphonious and more expressive. 
In connection with the tergites should be mentioned the little plates 
by means of which the wing veins articulate with the tergal region. 
Smith, 1906, gives the terms ossicles, osselets, and ossicula for these 
sclerites (doubtless taken from the term osselets, applied to these alar 
ossicles by the early French writers such as Jurine, 1820, and 
Chabrier, 1822). Snodgrass, 1909b, terms them axillaries. The 
designation pteralia, introduced by Groeschel, 1911, is an exceed- 
ingly appropriate term, and will doubtless become widely accepted. The 
principal pterale, or alar ossicle »pt, may be designated as the noto- 
pterale, since it is the most important one furnishing an articulation 
between the anterior wing veins and the notum. The adanal pterale 
(apt) is the alar ossicle by means of which the anal veins articulate with 
the notum. The other alar ossicles may be designated by the name of 
the veins with the bases of which they articulate. 
The shell-shaped cup or scale {g at the base of the wing was termed 
the parapteron or epaulette by Audouin, 1840—1842. The term 
parapteron has been applied to so many different sclerites that it is 
perhaps preferable to use the term epaulet, to designate the scale in 
