71 



3~l ^-^ 



- 106. 

 (ESTRUS PICTUS. 



Order Diptera. Fam. CEstricIiE Leach. Muscides Lat. 



Type of the Genus Qistrus Ovis Linn. 



CEsTRUs Linn., Geoff'., Fab., De Geer, Clark, Meig., Leach. 



Antennce approximating, inserted in a cavity in the centre of the 

 face, membranaceous, 5-jointed, basal joint nearly quadrate, 2nd 

 transverse, 3rd somewhat globular and more coriaceous, 2 fol- 

 lowing forming an awl-shaped naked seta, the basal joint of which 

 is very minute (fig. 3). 



Labrum, Tongue, Mandibles and Maxillce none. 

 Palpi} 2, minute, exarticulate, ovate, hairy, inserted below a 

 .small tubercle at the bottom of the head (2* c and c, detached 

 and more magnified). 

 Lip none. 

 Mouth none or concealed. Head vertical, short, arid blmit {2*, a front 

 view showing the situation of the antennce. Eyes lateral, not very 

 large, oval, more distant in the females than males («). Ocelli 3, 

 large, placed close together in a triangle upon the crown of the 

 head (b). Scutellum distinct. Abdomen with its apex deflexed, 

 acuminate in the females. Wings divaricating, punctured, containing 

 about 10 cells, the costal nerve not surrounding the wing, two of the 

 exterior cells united by transverse nerves before reaching the posterior 

 margin (9). Squamula /aro'e concea/i?2o- ^/je Halteres. Lega rather 

 slender, hairy. Tibise simple. Tarsi 5-jointed, basal and terminal 

 joints the longest, the remainder short with a few bristles. Claws 

 simple. Pulvilli large (8, afore leg). 

 Larvae smooth, fleshy, living in the frontal sinuses or under the skin of 

 herbivorous animals. 



PiCTUS Megerle, Wiedemann, Meigen Syst. Besch. v. 4. p. 172. n. 8. 

 Leachii Samouelle's MSS. 



Cinereous, silvery, covered with black hairs. Face and antennae 

 pale ferruginous, hoary, upper part castaneous, changeable with 

 gray ; a triangular spot upon which the ocelli are placed and 

 behind the eyes black tessellated with gray. Eyes ferruginous. 

 Thorax gray, shoulders and region of the wings ferruginous, a 

 quadrate spot narrowed before in the middle of the anterior 

 portion blackish, upon which are 2 intense black lines, with 2 

 black spots on each side, behind are 2 other black spots and a 

 slender line on each side. Scutellum castaneous, silvery at the 

 margin with 2 obscure black spots. Abdomen silvery gray va- 

 riegated with black. Wings transparent, yellowish towards 

 their base with obscure spots, the little transverse nerve near the 

 centre forming a spot ; nerves brown. Squamulae fuscous. 

 Legs ferruginous, thighs variegated with black and gray beneath. 



/« tJie Cabinet of Mr. Samouelle. 



