BY R. J TILLYARD. 749 



(ii.) Siihcosfal space (hc), the very narrow space between Sc and 

 R, fi'om base to pterostignia. It has no cross-veins in Myrme- 

 leonidcn. 



{ill.) Rndial space (r), between R and M, from base to origin 

 of Rs. The crossveins in it should be termed "radial crossveins" 

 (rx); there is only one of these in the hind wing of the Dendro- 

 leonince. 



(iv.) Median space (m), between M and Cu, from base to oblique 

 vein. The crossveins in it are the "median crossveins" (mx). 



(v.) Cubital space (cu), between Cu and 1 A, from base to Cu . 

 The crossveins in it are the "cubital crossveins" (cux). The 

 shape of this area, and the number of rows of crossveins in it, are 

 of considerable systematic importance. 



{\\.) Altai space (a,), between lA and the posterior border of 

 the wing. It may also be termed the "anal field," since it 

 includes 2A, and the remnant of 3A if present. Its form and 

 extent are of considerable systematic importance, as are also the 

 number and length of the "anal crossveins" (ax) running from 

 lA to the posterior border. 



Note on the Gender of Generic Names in Myrmeleonid.e. 



It might seem superfluous now-a-days to quote the rule given 

 in Art. 1 4 of the International Rules for Zoological Nomenclature, 

 that specific names, when adjectives, must "agree grammatically 

 with the generic name." However, it is necessary to do so, since 

 numerous authors seem to imagine that any generic name ending 

 in "6>?i" must necessarily be neuter. Thus we have recently had 

 the whole of the specific names in Glenoleon written in the neuter 

 by authors, though Rambur, in an age before Greek was 

 despised or disregarded by scientists, described the type-species 

 of this genus as 2fyrmeleon p>ulchellus. In a recent paper, I 

 find, on the same page, two new species, Protoplectron costatus 

 and P. palliduyn described I Other examples are Pseudoformicaleo 

 nubecula, Callistoleon erythrocephalum, etc. As the terminations 

 in use for generic names in Myrmeleonidm are very few, it may 

 be as well to give their derivations and genders for the guidance 

 of future Nvorker.s: — - 



