360 MEDICAL ENTOMOLOGY 



earth, and under leaves, etc., where they pupate. The puparium resem- 

 bles that of Mnsca. It measures from 5 to 10 mm. in length and is of 

 a light mahogany colour. 



Both Philaematomyia lineata and Ph. insignis may be bred by em- 

 ploying the same technique as in the case of the non-biting, blood-sucking 

 species of Musca (see page 355). 



THE STOMOXYDINAE 



Medium-sized flies of a greyish to brown colour, with four clove brown 

 to black longitudinal thoracic stripes, and with bands and spots on the 

 abdomen ; front in male narrow; in female wide. Arista with seven to 

 eleven bristles on its upper surface, and five on its lower ; in some species, 

 however, the lower bristles are wanting. Palpi shorter than, or as long 

 as, the proboscis, often spatulate or club-shaped. Proboscis with the 

 haustellum always greatly increased in length, so much so that when it 

 is in the resting position it forms a conspicuous projection in front of 

 the head. Labial gutter thickened, and the mentum consolidated to form 

 a spindle-shaped tube, and only connected with the labial gutter by a 

 narrow strip of membrane ; the discal sclerite modified into two lateral 

 plates connected vent rally on each side of the prestomum, and bearing at 

 the distal ends the prestomal teeth. The pseudotracheal membrane is 

 vestigial or entirely wanting. Thoracic chaetotaxy (macrochaetae): 

 Humeral 2 to 3 ; posthumeral 7 ; notopleural 2; presutural 7 ; supra -alar 

 7 ; infra-alar 7 ; post-alar 2 ; dorsocentral 3 to 5 ; acrostichal 7 or 2 ; 

 mesopleural 10 to 12; sternopleural 1 or 2, sometimes 3, arranged 

 : 7, or 1:2. Wings clear or of a tawny olive colour, longitudinal veins 

 with or without spines at their bases, but never with spines on the anterior 

 border. First posterior cell open at its extremity ; fourth longitudinal 

 vein curved gently upwards. Reproduction oviparous, larvae cylindrical, 

 with elongated and widely separated stigmata ; puparium dark brown. 



Bezzi gives the following Key to the Genera : 



1. Arista with bristles only on its upper surface ....... 2 



Arista with bristles on both sides ......... 4 



2. Palps slender, much shorter than the proboscis ; head in profile 



straight, height greater than breadth ; eyes long and 

 straight ; posterior sinuosity well developed. Arista with ten 

 to twelve straight bristles only on its upper border ; one 

 black sternopleural bristle arranged 0:1. Wings with first 

 and third longitudinal veins spinulose at base, fourth curved 

 upwards ; first posterior cell broadly open . , .... Stomoxys. 



