72 PROCEEDINGS OP THE NATIONAL MUSEUM vol. 6S 



Sunderland, West Springfield, Provincetown, Horscneck Beach, and 

 Martha's Vineyard, Massachusetts; Avalon, Anglesea, Clementon, 

 and Pemberton, New Jersey; Chesapeake Beach and Beltsville, 

 Maryland; Brookland, District of Columbia; Columbus, Ohio (H. 

 W. A.) ; Ira, Summit County, Ohio (J. S. Hine) ; Lafayette, Indiana 

 (J. M. Aldrich) , (E. W. Stafi'ord) ; Michigan City, Indiana (J. M. 

 Aldrich) ; Algonquin, Illinois (Nason) ; Great Falls, Virginia (J. M. 

 Aldrich) ; Flomaton, Alabama (J. M. Aldrich) ; Mobile, Alabama 

 (H. W. A.); Holly Springs, Mississippi (F. W. Mally) ; West Point, 

 Mississippi (F. M. Hull) ; Starkville, Meridian, Agricultural and 

 Mechanical College, Ocean Springs, Moss Point, and Gulfport, Mis- 

 sissippi (II. W. A.); White Springs, Florida (C. H. T. Townsend) ; 

 Milwaukee, Wisconsin (S. Graenicher) ; Mandan, North Dakota 

 (J. M. Aldrich); Powderville, Montana; Florissant, Colorado (S. A. 

 Rohwer) ; one Brookland, District of Columbia, labeled ''Parker 

 number 50." In one specimen in C. W. Johnson's collection from 

 Horseneck Beach, Massachusetts, the third antennal joint has 

 a blackish cast, over yellow. This is exceptional since most speci- 

 mens have bright yellow antennae. Although Coquillett states that 

 in this species the third joint is sometimes black, I am inclined to 

 believe, after careful study of a long series, that specimens in which 

 this joint is black without traces of yellow belong elsewhere. 



Three dried specimens of females have been dissected, and while 

 such material is unsatisfactory, some definite information has been 

 obtained on the nature of reproduction in this species. The uterus in 

 each case was found filled with large naked maggots , all in the same 

 stage of development. Fourteen were counted in one and eight in 

 another. The larvipositor was found to consist of small, weak, 

 nonpiercing valves located at the tip of an extensile apparatus of 

 three segments, in repose telescoped within the abdomen. 



The first instar maggot from the uterus was found to possess the 

 following characters. The cuticula of each segment with several 

 encircling rows of microscopic, transparent, flattened scales followed 

 by a band of transparent, longitudinal ribs or furrows, giving to the 

 lower part of the segment a coiTugated appearance; ventral part of 

 last segment provided with fleshy foot, densely beset with stout, 

 sharp, brown spines; no other brown spinose areas occur. Bucco- 

 pharyngeal apparatus (pi. 5, fig. 29) consists of the usual parts, in 

 which the median hook is longer and about equal in mass to the re- 

 mainder of the apparatus; the long, slender median hook tapers 

 gradually to a strong, slender point, without denticles on the ventral 

 surface; lateral hooks apparently fused at the tip to the median 

 hook; ventral part of the intermediate H-piece much reduced and 

 not barblike in profile view; upper and lower wings of the basal piece 



