344 DIPTERA OF NORTH AMERICA. [PART II. 



PLATE YIL 



37. Scellus AVIDUS Lw. % . 



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



38. Hydrophorus INNOTATUS Lw. $ . 



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



39. Medeterus DIADEMA Linn. . 



a. and 6. head $ , c. antenna , and d. wing 9 of the' same. 



40. Aclialcus FLAVICOLLIS Meig. 9 . 



a. and 6. head 9 > c- wing 9 > and d. wing 9 of the same. 



41. Xantlioclilorus HELVINUS Lw. $ . 



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



42. Chrysotimus PUSIO Lw. $ . 



a. head 9 1 b. antenna $ , c. wing $ of <?. molliculus Fall. 



43.. Saiicropus DIMIDIATES Zw. $ . 



a. antenna 9 from the outside, 6. antenna from the inside, c. 

 head 9 > ? head , and e. wing $ of the same. 



44. Psilopus FILIPES Lw. . 



a. head $ oi Ps.filipes. b. head of Ps. scobinator Lw. c. head 

 of Ps. pollens Wied. d. antenna $ of Ps. scintillans Lw. 

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

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

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

 Lw. i. wing $ of Ps. scobinator. 



