6 DIPTEKA. 



Hab. Nokth-westekn Noeth-Ameeica 1 . — Mexico, Ciudad in Durango 8100 feet 

 (Forrer). — Eueope. 



A single female specimen from Ciudad agrees very well with this species. 



MEGARRHINA. 



Megarhinus, Rob. Desvoidy, Essai &c. in the Mem. de la Soc. d'Hist. Nat. de Paris, iii. p. 412 



(1827). 

 Megarrhina, Macquart and later authors. 



l. Megarrhina ? 



Hab. Panama, San Miguel in the Pearl Islands (Champion). 



Two males. The fourth joint of the hind tarsi is white, except at the tip. 



Culicidse previously described from Mexico (there are none from Central America) : — 



Culex bigoti, Bellardi, Saggio &c. App. 3, f. 1. 



mexicanus, Bellardi, 1. c. i, p. 5. 



posticatus, Wiedem. Aussereur. zweifl. Ins. i. pp. 9, 15. 



Families CHIE0N0MID53 and PSYCHODID^I. 



I do not find any insects of these families recorded from Central America, nor are there 

 any in the collections before me. 



Fam. TIPULIDiE. 



TEUCHOLABIS. 



Teucholabis, O. Sacken, Proc. Acad. Phil. 1859, p. 222; id. Monogr. &c. iv. p. 129 (1868). 



l. Teucholabis molesta, sp. n., 6 . 



Black, shining, the collar, scutellum, and a few thoracic spots hright yellow ; abdomen with yellowish cross- 

 bands ; wings hyaline. 

 Length 5 millim. 



Hab. Mexico, Orizaba (Sumichrast). 



Thorax shining black ; collar, the humeral and prsescutellar callosities, the scutellum, 

 a triangular spot in the middle of the thoracic suture, another spot on the pleura above 

 the middle and the hind coxse, and a longitudinal stripe in the middle of the sternum 

 between the coxse, yellow ; halteres with a yellow knob, the stem brownish. Abdomen 

 blackish above, with yellow cross-bands; on the ventral side these cross-bands are 

 broader ; male forceps black. Head black ; palpi and antennae dark brown, the 

 underside of the scapus of the latter a little paler. Legs brownish-yellow ; knees, the 



