ANATOMY. 



37 



one in the Simuliidae and Empididse. Among the calypterate Muscidse 

 three is again the rule, though only two are found in the Stomoxyiinse. 

 Among the Acalypterse the numbers range from to 4. I have myself 

 examined several extra-drosophiline genera. These, with the forms 

 described by Wesche, may be tabulated as in table 2. 



Figs. 32-43. — Spermathecse. Magnified 250 diameters. 32. Drosophila nebulosa. 

 33. Drosophila obscura. 34. Drosophila putrida. 35. Drosophila quinaria. 

 36. Drosophila repleta. 37. Drosophila robusta. 38. Drosophila saltans. 

 39. Drosophila similis. 40. Drosophila transversa. 41. DrosophUa tripunc- 

 tata. 42, Drosophila virilia. 43. Drosophila willistoni. 



The receptacles of Lonchcea polita Say (Lonchseinse) and of Scato- 

 phaga stercoraria Linnaeus (Cordylurinse) resemble those of Leuco- 

 phenga varia. The telescoped type of receptacle so common among 



