OLFEKSIA SPINIFERA. 61 



OLFERSIA SPINIFERA, Leech. (Fig. 24.) 



Feronia spinifera, Leech, Mem. Wern. Nat. Hist. Soc. ii. 



p. 557, t. 26, f. 13. 

 Olfersia spinifera, Wied. Aussereur. Zweifl. Ins. ii. p. 607 ; 



Wulp, Tidj. v. Ent. xxiii. p. 193. 



FIG. 24. Olfersia spinifera, nat. size and magnified.* 



Pigeon Fly. 



In structure and general form this species is very 

 similar to the Ostrich Fly (H. struthionis], but it is a 

 rather smaller and an altogether more slender insect. 

 The head is narrower, and more closely attached to the 

 thorax, dull brown or piceous in the middle, the base and 

 sides next the eyes shining; the clypeus is brownish 

 yellow, shining, and has a large central notch in front. 

 The thorax is much narrower than in H. struthionis, 

 piceous or black, and without spots ; the anterior angles 

 are furnished with a large pointed tubercle, which 

 projects in front outside the back part of the eyes ; these 

 tubercles and the sides of the thorax are usually paler 

 than the other parts, and in some specimens are of a 

 very pale greenish, or yellowish, brown. The scutellum 

 is very short, transverse, and smooth ; it varies in colour 



* In the magnified figure the middle pair of legs are partially hidden 

 by the wings. E. A. 0. 



