14 MECOPTERA AND PLANIPENNIA 
of primitif insects contains much more species, belonging 
to the following families : 
Antennae clubbed at the apex, longer or shorter. 1. 
Antennae not clubbed at the apex. . . ... 3. 
1. Antennae short, rarely as long as head and thorax 
together. Wings with dense nervature, their apicalfield 
with many rows of oblique cells. — Larvae living in dry 
earth; running backwards and mostly making pittfalls 
(ant-lions). . . . . « « « «+ «+  Myrmeleonidae. 
Antennae very long, as long as the body. Wings much 
less densely reticulated, their apicalfield with 2—4 rows 
of large cells. — Larvae with 2 digitiform appendices 
at each abdominal segment; running forwards and not 
making pittfalls. . . . . . © . «Ascalaphidae. 
2. Mouth produced into a short beak, hindwings very long 
and narrow, setiform . . . . . . . Nemopteridae. 
Mouth conical, hindwings of the same form as the fore- _ 
wings or only somewhat smaller and narrower, wanting 
in some species but never setiform. . . . . . 3. 
3. Body and wings with a white exudation, nervature 
rather simple, but a few cross-veins; very minute forms. 
| Coniopterygidae. 
Body without a white exudation . . .... 4, 
4, Anterior legs deformed to raptorial legs. Mantispidae. 
All legs nearly equal user Weeen GOC 
5. One radial sector, parallel with the radius and forming 
the branches for the disc of the wing ... . 6. 
Radialsector wanting and the branches emerging im- 
mediately from the radius, so that there seem to be 
many radialsectors. . . . . « « … Hemerobidae. 
6. Antennae moniliform, short or moderately long, mostly 
shorter than the wings oe tet eet ON 
Notes from the Leyden Museum, Vol. XXXL. 
