4 Transactions of the Society. 



Group 6. — The mandibles are fused into the labium; the car- 

 dines, stipites and laciniai of the maxillae are present, the latter 

 leaf-shaped and pubescent ; the paraglossa? are without teeth ; the 

 palpi are labial. 



Phycodromida?. (Type Coelopa frigida Mg.) 



Helomyzida3. 



■Sciomyzida?. 



1 'silidse. 



Saprornyzidif. 



Group 7. — The mandibles are fused into the labium ; the 

 maxillse are imbedded, the palpi being the only part exposed, 

 labial palpi are also present ; the trachea? of the paraglossa? are 

 more or less well developed. 



Opomyzida?. 



Sepsida:-. 



Ephydrida?. 



Drosophilida;. 



Borborida?. (Type B. equinusYln.) 



EXPLANATION OF PLATE II. 



—Maxillary palpus, stipes, and cardo of Ctdcx annulipes Mg. ? , to show 

 the atrophied fourth joint^whieh is absent in C. jiipicns 9 . 



—End of lacinia of maxilla of an undetermined species of Culex ? 

 from Windsor, Nova Scotia, for comparison with the same part on 

 fig. 21 C. annulipes ?, a British species. This and fig. 21 have been 

 carefully drawn to scale to show the exact relative size. 



—End of lacinia of maxilla of C. annulipes, to compare with fig. 20. 



—Pharyngeal pump of Tipula oleracea L. Dorsal view. 



—Pharyngeal pump of 2'. oleracea. Lateral view. 



— Section through the anterior portion of the head of T. oleracea, to show 

 the pharyngeal pump and its muscular attachments. Drawn from a 

 preparation made by the late Dr. Scriven. 



— Trophi of Ghloromyia formosa Scop. Dorsal view. 



— Mentum of C. formosa. Removed from the ventral side of the labium, 

 and showing the median suture (imbedded mandibles). 



—Trophi of CaUimyia speciosa Mg. A genus of the Platypezidse. Lateral 

 view. 



—Mentum of Platypeza consobrina Ztt. 



— Hypopharynx of P. consobrina. 



— Labrum of P. consobrina. 



— Hypopharynx, pharyngeal pump, and portion of pharynx of an unde- 

 termined species of the genus Dolichopus. 



— Trophi of Gymnoptemus assimilis Staeg. Dorsal view. 



— Dissection of the labium of Aphrosyhis raptor Hal. Dorsal view. The 

 muscles and the ventral plate have been removed. The mentum can 

 be clearly seen, and the absence of a median suture noted. 



— Hypopharynx and pharyngeal pump of A. raptor. Lateral view. 



— One of two plates (mandibles) imbedded in the muscles on the ventral 

 side of the labium of A. raptor. 



— Labrum of A. raptor. Lateral view, and showing the lever which works 

 the part. 



— Part of the labrum of A. raptor. Flattened out and seen from the 

 dorsal side. 



