13 



/3-)S3L 



609. 

 SCENOPINUS RUGOSUS. 



Order Diptera. Fam. Scenopinidae. 



Type of the Genus, Musca fenestralis Linn. 



ScENOPiNus Lat., Fab., Meig., Curt. — Atrichia Schr. — Nemotelus 

 DeG., Panz. — Musca Linn., Fab. 



Antenna short, nutant, inserted at the lower part of the face, 

 close to the mouth, triarticulate, 2 basal joints somewhat cup- 

 shaped, 2nd with a few short bristles round the margin, 3rd 

 elongated, somewhat conic, compressed at the apex, not forming 

 an angle with the others, seta none (3). 

 Trophi small, concealed in a cavity beneath the head. 

 Labrum short, broad and hollow (b), not more than half as long 

 as the palpi. Tongue and Maxilla none ? Palpi large, as long 

 as the lip, clavate, pubescent, with a few bristles on the inside 

 (/). Lip short broad, cleft at the apex and forming 2 pube- 

 scent and pilose lobes {g). 

 Head hemispherical : eyes contiguous in the male, and divided by a line 

 horizontally (2), remote in the female : ocelli 3 in triangle at the 

 base. Thorax oblong : scutel transverse, semiovate. Abdomen 

 sublinear, depressed, 8-Jointed, with 2 oval punctured or hairy spots 

 on the back of the 2nd segment, which is the longest, the apex trigo- 

 nate. Wings incumbent, parallel, with a long marginal cell divided 

 by an oblique nervure, 2nd longitudinal nervure approaching the \st 

 at the apex, one discoidal and 3 elongated basal cells (9). Halteres 

 large and capitate. Legs short, especially the anterior, hinder the 

 longest : tibiae simple : tarsi 5-jointed, basal joint elongated, 4th ob- 

 trigonate, 5th short : claws and pul villi small. 



RuGosus Fab. — Curt. Guide, Gen. 1261. 7. 



Piceous, with a bluish gloss ; eyes and antennae brown ; face 

 with a fovea above the antennae ; abdomen transversely rugose : 

 wings fuscous, darkest at the costa ; halteres entirely piceous ; 

 tarsi, especially the hinder, ochreous at the base. 

 In the Author's Cabinet. 



Similar as this genus is in habit to Beris (pi. 337.) and some 

 of the Stratiomydae, neither the form of the antennae nor the 

 neuration of the wings will justify its being removed to that 

 family : it certainly is not happily located by Meigen, for it is 

 more allied to Platypeza and Pipunculus in its habits and form 

 than to Lonchoptera and Conops (pi. 377.); it is, however, one 

 of those osculant types which has no direct affinity with any 

 other known group. The structure of the eyes also is remark- 

 able, the upper portion in the males being more coarsely check- 

 ered than the lower half; the dotted line in fig. 2. ^ shows 

 this division : there are also 2 oval hairy spots, hitherto un- 

 noticed, on the back of the 2nd segment, at least in 3 of the 



