344 DIPTERA OF NORTH AMERICA. [PART II. 



PLATE TIL 



37. Scellus avidds Lw. % . 



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



38. Hydrophorus innotatus Lw. £ . 



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



39. Medeterus diadema Linn. % . 



a. and b. head £ , c. antenna % , and d. wing <j> of the same. 



40. AclialdlS flavicollis Meig. $> . 



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



41. Xaiithochlorus helvinus Lw. % . 



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



42. Chrysotinius -pusio Lw. %. 



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



43. Saucropus dimidiatus Lw. % . 



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

 head J , 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. pallens Wied. — d. antenna £ of Ps. scintillans Lw. — 

 e. antenna % of Ps. pilosus Lw.— -f. antenna % of P&. comatus 

 Lw. — g. antenna % of an undescribed species from Ceylon, 

 related to Ps. globulifer Wied. — h. wing % of Ps. psittacinus 

 Lw. — i. wing £ of Ps. scobinator. 



