330 INSECTA SAUNDERSIANA. 



hoary stripes; the inner pair slender: breast hoary : abdomen cinereous, 

 tessellated with black ; tip pale gold-colour : legs black ; thighs with a 

 hoary covering : ivings almost colourless ; bordei's of the veins tinged ttdth 

 brotvn : alulae white : halteres yellow. Length of the body 4h lines ; of 

 the wings 9 lines. 



South America. 



Genus MUSCA, Linn. 

 The species here described will form the following groups : — 



a. Mouth slender Stomoxys. 



b. Prffibrachial vein forming a very obtuse angle at its flexure. 



cuprea. 

 b b. Praebrachial vein forming a very gentle curve at its flexure. 



occidentis, concolor. 

 a a. Mouth thick. 



b. Sixth feeler-joint feathered with short hairs, downy towards the tip. 



divisa. 

 b b. Sixth feeler-joint feathered with long hairs. 



c. Third feeler joint soft Calliphora. 



d. Praebrachial vein forming a hardly acute angle at its flexure. 



incerta. 

 d d. Praebrachial vein forming a right angle at its flexure. 



aucta. 

 d dd. PrEebrachial vein forming a right but not sharply defined angle at 

 its flexure. 



violacea, inducta. 

 dd d d. Praebrachial vein forming a slightly obtuse angle at its flexure. 



sufi'usa. 

 cc. Third feeler-joint rigid. 



d. Facialia without bristles. 



e Praebrachial vein forming a right angle at its flexure Chrysomyia. 



turbida, fasciata. 

 e e. Praebrachial vein forming an obtuse angle at its flexure. 



purpurea, polita. 

 d d. Facialia bristly at the base. 



e. Praebrachial vein forming an angle at its flexure. 



