290 NYCTERIBTD.E. 



appear like a tube ; bat if cut off they will separate and show the 

 siphuncle, as fine as a hair, between them." 



1. ovinus, L. Fn. 1923 (1761) ; F. ; Schr. ; Frisch ; Pz. ; Nitzsch ; 

 Fal.; Latr. ; Leach; Meig. ; Mcq.; Zett. aptera, L. I. Westrogoth. 

 Fulvus, capite subtus albido, abdomine ferrugineo, unguibus riigris. 

 Long. 2 lin. 



Tawny. Head whitish beneath. Eyes brown. Abdomen ferru- 

 ginous. Ungues black. 



Generally distributed. (E. S. I.) 



FAMILY XXXI. NYCTEEIBID^E. 



NYCTERIBIDJE, Leach, Eprobosc. Ins. (1815). Notostomata, Leach, 

 Suppl. Euc. Brit. Nycteribiidce, Westw. Phtliiromyii, Latr. ; Mcq. 

 Nycteribiites, Blanch. Diptera p., Latr. 



Caput reversttm, et subversum, supra mesonotum. 



Head turned back) and upside down, over the mesonotum. 



Genus I. NYCTERIBIA. 



NYCTERIBIA, Latr. Free. Car. Gen. (1795); F. S. A.; Fal.; Meig.; 

 Mont. ; Leach ; Curt. ; Westw. ; Mcq. ; Zett. Pediculus p., L. Fn. 

 Acarus p., F. Sp. Hippobosca p., L. ; F. Ent. Syst. ; Schr. ; Voigt. 

 Celeripes, Mont. PhtMridium, Herm. ; Olfers ; Leach. 



Caput parvum, obconicum, antice setosum et emarginatum. Oculi 

 tuberculis paucis, aut simplices. Os basi tumidum, antice styhforme. 

 Antenna? biarticulata3, brevissimae, approximate, porrectse, parallela? ; 

 articulus secundus primo longior, subtrigonus, externe rotundatus. 

 Thorax brevi-ovatus, supra elevato-areolatus," subtus planus, linea 

 media longitudinali, appendice utrinque pectinata. Pedes crassi, 

 longissimi, setosi ; coxae anticee sat longaB ; trochanteres brevissimi ; 

 femora valida, compressa, transverse impressa ; tibiaa graciliores, basi 

 quasi triarticulatas ; tarsi articulo primo longissimo subannulato, 

 secundo, tertio, quartoque brevissimis, quinto longiore ; onychia duo 

 magna; ungues duo validi, basi subtus dilatati. Mas. Abdomen 

 5- aut 6-articulatum. Fcem. Abdomen quasi biarticulatum. 

 Body crustaceous ; thorax above and abdomen leathery. Head small, 



obconical, furnished with seta?, and slightly emarginate in front above, 



more deeply so beneath. Eyes composed of a few tubercles, or simple. 



Mouth with a large basal bulb-like organ, terminating in an elongated, 



