Cleptobiosis: see symbiosis.

Dulosis: see symbiosis.

c.o.xal file: in some aquatic Coleoptera a series of striations just above the hind c.o.xa of male and, perhaps, a stridulating organ.

c.o.xal plates: plate-like expansions or dilations of the c.o.xa: specifically in aquatic Coleoptera on the posterior pair.

Ecto-parasite: one that is attached to the external surface of the host.

Ento-parasite: one that feeds within the body of the host.

Embioptera: an ordinal term proposed for the Neuropterous family Embidae.

Hamabiosis: see symbiosis.

Heliophobic: loving darkness: applied to species that shun the light, like, e.g. Termites.

Heliotactic: light loving: applied to species that live in the open and in daylight.

Lestobiosis: see symbiosis.

Meron: in Neuroptera, a sclerite posterior to the c.o.xa and below the epimeron: corresponds to the trochantine in Lepidoptera.

Metasternal wing: in some aquatic Coleoptera a leaf-like expansion above the c.o.xal plates.

Myrmecophily: is the relation existing between ants and those guests that seek their company primarily for their own individual advantage.

Phylacobiosis: see symbiosis.

Prosternal process: in aquatic Coleoptera a modification of the prosternum used in the differentiation of species.

Sub-clypeal pump: in some Diptera, the enlarged, more or less bulb- like structure at the anterior entrance of the oesophagus.

Sub-clypeal tube: in Diptera: see pharynx.

EXPLANATION OF PLATES.

PLATE 1. Structures of the External Body Wall.

1. Harpalus caliginosas showing the underside, and the head from above, to show the regions and the position of the sclerites.

2. Thorax of a Dipteron to show location of bristles.

3. Lateral view of a denuded Lepidopteron to show arrangement of sclerites.

4. Abdominal segment of a caterpillar to show the position of the tubercles.

5. Lateral view of a dragon fly to show the body sclerites.

All the abbreviations used in this plate are readily understood.

PLATE II. Structures of Head, Mouth, Thorax & Genitalia

1. Head of wasp from front.

2. Head of honey bee with mouth parts extended.

3. Head of Locustid from front, to show regions.

4. Head of a Lepidopteron from front.

5. Head of a cricket from front.

6. Labium of a cricket showing all usual parts.

7. Maxilla of Harpalus caliginosus, with all sclerites marked.

8. Mandible of Copris carolina with all sclerites defined.

9. Thorax of a Hymenopteron from above.

10. Genitalia of a male mosquito with all parts named.

11. Genitalia of a male Noctuid from below: the parts separated out.

PLATE III. Venation According to the Comstock System.

1. Wing venation of a Noctuid.

2. Wing venation of a Hepialid.

3. Wing venation of a Locustid.

4. Wing venation of a Hymenopteron.