Part 41

Detritus: rubbed off; a surface partly denuded.

Deuterotoky: parthenogenetic reproduction when the progeny are male and female: see arrhenotoky and thelyotoky.

Deutocerebral segment: =antennal segment; q.v.

Deutocerebrum: the middle portion of the brain, formed by the ganglion of the 2d primary segment; also termed antennal or olfactory lobes from the parts it innervates.

Deutoplasm: the yolk or food plasm of an ovum.

Deutotergite: the secondary dorsal segment of the abdomen.

Dextrad: extending or directed toward the right.

Dextral: to the right of the median line.

Dextro-caudad: extends obliquely between dextrad and caudad.

Dextro-cephalad: extends obliquely between dextrad and cephalad.

Di: as a prefix, = two.

Diaphanous: semi-transparent; clear.

Diaphragm: any thin dividing membrane; that thin membrane separating the cavity containing the heart from the rest of the body.

Diarthrosis: any articulation that permits of motion.

Diastole: that regular expansion of the heart that draws the blood inward: see systole.

Dichaetae: a group of brachycerous Diptera with a proboscis consisting of two parts: Muscids, etc.

Dichoptic: Diptera; eyes separated by front: not contiguous: see holoptic.

Dichotomous: forked: dividing by pairs.

Dichromatism: the possession of two color varieties.

Dictyoptera: an ordinal term applied to the roaches: also more generally, to the Orthoptera. {Scanner's comment: Roaches are now classed as Dictyoptera, and Orthoptera are now classed as distinct from Dictyoptera}

Didactyle -us: two-toed: with two tarsi of equal length.

Didymus: double: geminate.

Difformis: irregular in form or outline: not comparable; anomalous. Diffracted: bending in different directions.

Diffuse: spreading out; without distinct edge or margin.

Digestive tract: the alimentary canal as a whole: more specifically that portion behind the crop, in which assimilation takes place.

Digitate: finger-like, or divided into finger-like processes.

Digitiform: formed, shaped like or having the function of a finger.

Digitules: appendages on the feet of Coccidae; in Lecanium, four knobbed hairs.