290 NYCTERIBTD^E. 



appear like a tube ; but 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 nigris. 

 Long. 2 lin. 



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

 ginous. Ungues black. 



Generally distributed. (E. S. I.) 



FAMILY XXXI. NYCTEEIBID^. 



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

 Suppl. Enc. Brit. Nycteribiida?, Westw. PMMromyii, Latr. ; Mcq. 

 Nycteribiites., Blanch. Diptera p., Latr. 



Caput reversum, et subversum, supra mesonotum. 



Head turned back, and upside doivn, over the mesonotum. 



Genus I. NYCTERIBIA. 



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

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

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

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



Caput parvum, obconicum, antice setosum et emarginatum. Oculi 

 tnberculis paucis, aut simplices. Os basi tumidum, antice styliforme. 

 Antennae biarticulataB, brevissima3, approximate, porrectas, parallela? ; 

 articulus secundus primo longior, subtrigonus, externe rotundatus. 

 Thorax brevi-ovatus, supra elevato-areolatus, 9 subtus planus, linea 

 media longitudinali, appendice utrinque pectinata. Pedes crassi, 

 longissimi, setosi ; coxae anticas sat longse ; trochanteres brevissimi ; 

 femora valida, compressa, transverse impressa ; tibia3 graciliores, basi 

 quasi triarticulataB ; 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. Foem. 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, 



