344 DIPTERA OF NORTH AMERICA. [PART II. 



PLATE VII. 



37. Scellus avidus Lw. % . 



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



3S. Hydropliorus 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 b. head J , c. wing £ , and d. wing 9 of the same. 



41. Xantliochlorus helvinus Zw. % . 



a. head £ , b. antenna % , c. wing £ of X. ornatus Hal. 



42. Clirysotimus pusio Lw. %. . * 



a. head 9 > &■ antenna £ , c. wing £ of C. molliculus Fall. 



43. Saucropus dimidiatus Lw. % . 



a. antenna 9 fr° m 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. — 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 P&. 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. 



