344 DIPTERA OF NORTH AMERICA. [PART II. 



PLATE VII. 



37. Scellus AVIDUS Lw. . 



a. head , b. antenna , and c. wing $ of the same. 



38. Hydropltorus INNOTATUS Lw. . 



a. antenna ^ , b. head 9 c - wing of the same. 



39. Medeterus DIADEMA Linn. . 



a. and b. head , c. antenna , and d. wing 9 of the same. 



40. AchalcUS FLAVICOLLIS Meig. 9 



a. and b. head 9 > c - wing 9 > an( i d. wing 9 f the same. 



41. Xantlioclllorus HELVINDS Lw. $ . 



a. head , 6. antenna $ , c. wing $ of X. ornatus Hal. 



42. Clirysotimus PUSIO Lw. % . 



a. head 9 , b. antenna $ , c. wing of C. molliculus Fall. 



43. Saucropus DIMIDIATUS Lw. ^ . 



a. antenna 9 from the outside, b. antenna from the inside, c. 

 head 9 d. head $ , and e. wing $ of the same. 



44. Psilopus FILIPES Lw. $ . 



a. head of Ps. filipes. 6. head $ of Ps. scobinator Lw. c. head 

 of Ps. pollens Wied. cZ. antenna of Ps. scintillans Lw. 

 e. antenna of Ps. pilosus Lw. -f. antenna of Ps- comatus 

 Lw. jr. antenna of an undescribed species from Ceylon, 

 related to Ps. globulifer Wied. h. wing $ of A. psittacinus 

 Lw. i. wing of Ps. scobinator. 



