356 



PSYCHE. 



[May 1899. 



from those of Corcthra. The mouth- 

 parts are very much elongated to form 

 the long, slender, sucking 'proboscis. 

 The females (iig. 8 B) which are 

 blood sucking possess mandibles. The 

 labrum-epipharynx (fig. 8 B, /. ep}) the 

 mandibles (fig. 8 B, mJ) maxillar lobes 

 (fig. 8 B, mx. I.) and hypopharynx (fig. 

 8 B, hyp") appear as long, slender 

 pointed piercing stylets, which lie 

 almost completely enclosed in the 

 equally long, slender lubium (fig. 8 B, 

 //) whose lateral margins turn up and 

 in so as to form a sheath, opening along 

 the median dorsal line, for the stylets. 

 The distal extremity of the labium is 

 divided into three parts, representing 

 the greatly reduced terminal lobes, para- 

 glossae and fused glossae. Thus it is 



Fig. 9, Mouthparts of Rhyphus sp. : /. ep. 

 labrum-epipharjTix, mx. maxilla, ?«.v. /. max- 

 illar lobe, mx.p. maxillar palpus, //. labium, 

 pg. paraglossa, gl. glossa, hyp hypophar\nx. 



the basal labial sclerite which is so 

 elongated and which forms the sheath 

 for the remaining mouth parts. The 

 maxillary palpi are short (compara- 

 tively) and only 3-segmented. The 



mandibles are finely serrate on the dis- 

 tal part of their inner margin. 



The mouthparts of the male form a 

 long, slender, proboscis-like organ, but 

 there are no mandibles and the maxillar 

 lobes are short and very delicate. The 

 maxillar palpi are as long as or longer 

 than the labium and are 4-segmented, 

 the second segment being especially 

 long. The labrum-epipharynx, hypo- 

 pharynx and labium are as in the 

 female. 



Rhvphidae. 



RhypJiiis sp. Rliyphus has no man- 

 dibles, in female or male. The labnun- 

 epipharynx (fig. 9, /. ep.) is elongate, 

 triangular, pointed at apex, and bears a 

 number of taste pits (?) on its under 

 (inner) or epipharygngeal surface. 

 The maxillae (fig. 9, m.x) present 

 a delicate, flattened, membranous, 

 rather long lobe, and 4-segmented 

 palpi. The labium (fig. 9, //') 

 shows an interesting condition : 

 the basal sclerite has a median 

 longitudinal line, and there are 

 three terminal lobes ; the outer or 

 paraglossae are 2-segmented and 

 the narrower, pointed, median one, 

 representing the fused glossae, is nearly 

 as long as the paraglossae and free for 

 its whole length. The hypopharynx (fig. 

 9, hyp) is especially well chitinized : it 

 is sharp pointed, and the pharyngeal 

 skeleton at its base is well developed. 



BiBIONIDAE. 



Bibio sp. Bibio sp. presents a similar 



