GASTKllOPIIILUS. 273 



"Tliis is supposed to be one of tlie two species of gad-lly which 

 infest fallow-deer. One of these deposits its eggs in an orifice it 

 makes in the skin of the animal, and so produces tumours; the 

 other lays its eggs in such a manner that its larvae, when hatclied, 

 can make their way into the head, where they take their station 

 in a cavity near the pharynx. There are two fleshy bags as big 

 as a hen's egg, and of a similar shape, near the root of the tongue 

 of the deer; these are inhabited by the larva? in considerable 

 numbers, and between sixty and seventy bots have been taken 

 from one of them. The larvae have been found in England in 

 deer that had been killed for venison ; they were stationed in the 

 throat, just at the commencement of the oesophagus. They much 

 resemble the larvae of (Esirus Ovis, but are proportionately longer 

 and less angular." Very rare. (E.) 



Genus III. GASTEROPHILUS. 



Gasterophilus, Lea. ffistrid. Ins. (1817); Zett. CEstrus p., L. ; 

 D. G.; F. ; Hbst. ; Schr. ; Gmel.; Clark; Fal. ; Latr. ; Mcq. ; 

 Guer. ; Westw. Gastrus, Meig. 



Corpus sublineare, hirtum. Caput breve, tliorace angustius. Frons 

 magna, antice latior. Facies parva, concava. Anteuuae brevissimae. 

 y^l^s mediocres ; vena costalis ala multo brevier ; 'prcehracldalis ad 

 marf/lnem posticmn termiuata ; discalis transversa fere recta, subob- 

 liqua. Alulce minimis. Abdomen subtus recurvum, tborace longius. 

 Pedes mediocres ; ungues et onychia sat longa. 

 Body nearly linear, hairy. Head short, narrower than the thorax. 

 Interfrontalia large, triangular. Front broad, widening towards the 

 fore border, which is concave. Face small, concave. Geua3 large. 

 Eyes of moderate size, rather naiTow, nearly eUiptical. Antennae very 

 short, seated in the cavity of the face ; tirst and second joints very mi- 

 nute ; third round ; fourth and tifth obsolete ; sixth setiform, slender, 

 bare. Thorax not longer than broad, with a slight transverse furrow ; 

 scutellum small, nearly semicircular. TFi)igs moderately long, slightly 

 rugulose ; costal vein ending at some distance in front of the tip of the 

 wing ; subcostal ending at much before half the length ; mediastinal 

 ending at before two-thirds of the length ; radial ending at about tive- 

 sixths of the length ; cubital ending at the tip of the costal ; prcebra- 

 cJiial nearly straight, dighthj inclined Jundward, and ending on the hind 

 border at some distance from the tip ; pobrachial and anal curved to- 

 wards the bind border ; discal transverse nearly straight, slightly ob- 

 lique, parted by nearly four times its length from the border. Alula 

 very small, tialteres uncovered. Abdomen as broad as the thorax, 



VOL. II. 2 N 



