1956] 
Adams — Myrmeleontidae 
85 
the glycerine will remain at the bottom of the vial whether 
the specimen is stored in a flat tray, or in a box placed 
vertically on a shelf. 
Among the measurements given are the lengths of the 
pterothorax and the third abdominal tergite. These lengths 
can be measured easily and accurately; their ratio gives a 
value useful in describing the amount of abdominal elonga- 
tion. 
Although the size of the labial palpi varies considerably 
within a given species, the size and shape of the terminal 
segment tends to be quite characteristic. In this segment is 
a sense-organ, 4 to accomodate which it is swollen to a great- 
er or lesser degree. In the male, the terminal segment is 
often smaller than in the female. 
Genus Eremoleon Banks. 
Banks, 1901, Trans. Am. Ent. Soc. 27:365; 1928, Bull. Mus. 
Comp. Zool. 68 : 69-71 ; Proc. Calif. Acad. Sci. 4th Ser. 24 : 
143-144. 
This genus is still too poorly represented in collections 
to enable a full-fledged revision; the following is simply a 
list of the described species, with a key and such figures as 
may be found helpful in identification. 
Key to the Species of the Genus Eremoleon. 
1. A very slender species, the antennae about IV 2 times 
length of head and thorax together; third abdominal 
tergite 1.4 times length of pterothorax longior 
— More robust, the antennae at most equal to length of 
head and thorax together; third abdominal tergite at 
most equal to length of pterothorax 2 
2. A deep black mark on base of fore wing, mesepimeral 
wing process black nigribasis 
— No such mark, mesepimeral wing process brown or 
yellow 3 
3. CuP-f- Ai in fore wing curved forward, margin curved 
outward, so that the space between is wider in middle 
than at ends ; prothorax wider than long . mexicana 
4 Eisner, T., 1953, J. Morph. 93:109-122. 
