GLOSSARY. XV 



Hcterodacfyla. — The second of tlie two divisions into which Braiicr divides his 

 Platvgenya, wliieh hitter is tlie first division of his ORTiiouRiiAniA 



BUACIIYCEIIA. 



Hvlopiic. — Used of the head when tlie eyes ai-e contiguous; opposed to 



diehoptic. Generally a character of the male sex onlj-, but exceptions 



occur in several families. 

 Hummdacfyla. — One of the two divisions into which Ei-auer divides his 



Platvgenya. See Hetcroclacti/la. 

 Ilovcru/f/. — This term expresses the habit of some flies of remaining quite 



.stationary in the air, then suddenly darting away a short distance and 



again remaining stationary. 

 Humerus. — The shoulder or antei-ior corner of the thoracic dorsum; when it 



takes the form of a more or less distinct bump it is known as the 



humeral callus. 

 Hi/poccra.— The name given to a superfamily consisting only of the Piiorid.e. 

 Hypoplcura.— The pleural area between the metaploura and the hind cox^. 

 Hi/ popygium.— The male genital apparatus as a whole, as distinct from that of 



the female. 



IiH((Cjlnal disks. — Centres of the formative tissue in the larvjn' of certain insects 

 especially Diptera, which give rise to the legs, wings, etc. 



Infcrcalary veins (Loew).— The lower prongs of the upper and lower branches 

 respectively of the 4th longitudinal vein (p. 12). The term has been 

 used by subsequent authors for various veins, but without obtaining 

 general acceptanoe. 



Johnstons organ. — A minute structure in the 2nd antennal joint of Diptera 

 which is supposed to contain the auditory nerves. 



Lahclla.—X. pair of organs, generally more or less oval or rounded, nearly 

 always at the tip (occasionally at the middle) of the proboscis. 



Lahi'um. — The lower lip. In Diptera always the lowest part of the proboscis, 

 and constructed, in the most highly developed forms, more or less like 

 a groove or case in which the remaining parts can be folded and covered 

 by the labrum. 



Labru, a. —The upper lip, the uppermost part of the proboscis in Diptera. 



LauiMa, lamdlcB. — Small leaf-shaped extremities to the ovipositor in the 

 female. A general term also for an oval or leaf-shaped flattened 

 terminal or projecting process. 



Lamella bascdis supera and lamella hasalis i«/cra.— Westhoff's names for the 

 upper and lower sides respectively of the 8th abdominal segment. He 

 terms the upper and lower sides of the 9th segment (namely, those 

 actually forming the genitalia) lamella terminalis supera and infera, but 

 the terms have not been adopted by other authors. 



MacrochcEtie. — The large strong bristles in Diptera distributed over various 

 parts ol the body, which are constant and possess a very high taxonomic 

 value. The study of this subject is termed Chatotaxy. 



Marginal cell. \ 



Mediastinal cell. { ^'' ^'^'- ^ ''^''^ ^■'- 



