124 



hvoraf de 2 yderste foruden de sædvanlige Eaarbørster er 

 forsynede med QOgle faa (3) Sandsevedhæng at den sæd- 

 vanlige smale, lineære Fonn. Hos .V. oblongus repræsen- 

 teres derimod hele Svøben af et enkelt enormt udviklet 

 kolbeformigt Sandsevedhæng. 



2det Par Polere (Fig. 33) er omtrent dobbelt saa 

 lange som Iste Par og ialmindelighed vinkelformigt bøiede, 

 med Endepartiet bagudrettet. Af Skaftets 5 Led udmærker 

 det 2det sig derved, at det paa den ydre Side gaar ml i 

 el stærkt, udadrettet, tornformigt Fremspring. lsteog3die 

 Led er ganske korte, hvorimod de 2 sidste er mere for- 

 længede. Svøben er traadformig, aoget kortere end Skaftet 

 og sammensat af 13 med simple Børster besatte Led. 



Overlæben (Fig. 34) danner en liden afrundet, lige- 

 som af 2 Segmenter bestaaende Lap. der er bevægeligt 

 forbundet med Epistomet. 



Underlæben (Fig. 35) har 2 ganske korte, i sin indre 

 Kant cilierede Endelapper. 



Kindbakkerne (Fig. 36) viser den for Familien sæd- 

 vanlige Bygning. Det forreste tandede Parti har tæt bag 

 Spidsen en Gruppe af stive Børster og er ved et dybt 

 vinkelformigt Indsnit skilt fra Tyggeknuden ; denne har 

 Formen af en cylindrisk, næsten under en ret Vinkel fra 

 Corpus udgaaende Fortsats, der i Enden er noget skraat 

 afkuttet og her forsynet med den sædvanlige rirlede Skulp- 

 tur. Palpen er vel udviklet, omtrent af selve Kindbakkens 

 Længde og bestaaende af 3 tydelige Led, hvoraf det mid- 

 terste er længst. Endeleddet er stærkt krummet og langs 

 sin indre Kant forsynet med en Rad af cilierede Torner. 

 Ved Enden at 2det Led sees en Gruppe lignende Torner 

 eller Børster; forøvrigt er Palpen ganske nogen. 



Iste Par Kjæver (Fig. 37) er af sædvanligt Udseende. 

 Den indre Tyggelap er ganske smal og noget bugtet; de 

 paa samme fæstede Børster "meget smaa. 



2det Par Kjæver (Fig. 38) har de 2 ydre fingerfor- 

 mige Fortsatser meget smale og ved Spidsen forsynede med 

 3 tynde Borster. 



Kjævefodderne (Fig. 39) udmærker sig i hoi Grad ved 

 den usædvanlige Udvikling af Tyggelappen. der er betydelig 

 større end selve Basaldelen og af aflang 4-sidet Form, med 

 det indre Hjørne udtrukket til et skarpt tandformigt Frem- 

 spring. Derimod er Palpen ualmindelig smal og simpelt 

 cylindrisk, forøvrigt sammensat af det normale Anta] Led. 

 At' disse ei- det 2det længst og ligesom de følgende ved 

 Spidsen forsynet med nogle faa simple Børster. Den plade- 

 formige Epignath er stærkt udviklet, af uregelmæssig tre- 

 sidel Form og rækker med sin stumpe Spids omtrent til 

 Enden af Palpens 3die Led. 



of the peduncle tåken together, and consisting of 4 distinctly 

 defined joints, of which the 2 outermost, apart from the 

 usual auditory bristles, are furnished with a fe w (3) sensory 

 appendices, of the normal slender, linear fonn. In N. ob- 

 longus, on the other hand, the whole flagellum is represented 

 by a single, prodigiously developed, cucubiter-shaped sensory 

 appendix. 



The 2nd pair of antennæ (fig. 33) are about twice 

 as long as the Ist pair, and. as a rule. angularly bent, 

 with the terminal part directed backward. Of the 5 joints 

 of the peduncle. the 2nd is distinguished by its jutting forth 

 on the outer side as a strong, ontward-directed, spiniform 

 projection. The Ist and 3rd joints are quite short, whereas 

 the 2 last occur more produced. The flagellum is fili- 

 form, somewhat shorter than the peduncle, and composed 

 of 13 articulations, beset with simple bristles. 



The labrum (fig. 34) forms a small rounded lobe, 

 consisting, as it were, of 2 segments, and movably con- 

 nected with the epistome. 



The labium (fig. 85) has 2 very short terminal lobes, 

 ciliated along the inner margin. 



The mandibles (fig. 36) exhibit the structure charac- 

 teristic of the family. The anterior dentate part has in 

 immediate proximity to the point a group of stift' bristles, 

 and is, by a deep angular incision. cut off from the molar 

 protuberance; the latter presents the form of a cylindric 

 projection, jutting forth almost at right angles with the 

 corpus, the said projection being somewhat obliquely truucate 

 at the extremity and furnished there with the usual fluted 

 sculpturing. The palp is well developed, about equal in 

 length to the mandible itself, and composed of 3 distinct 

 articulations. of which the middle one is longest. The 

 terminal articulation very considerably curved, and furnished, 

 along its inner margin, with a series of ciliated spines. At 

 the extremity of the 2nd articulation occurs a group of 

 similar spines or bristles; for the rest, the palp is entirely 

 naked. 



The Ist pair of maxillæ (fig. 37) has the usual ap- 

 pearance. The inner masticatory lobe is quite slender. and 

 somewhat sinuous; the bristles attached to the lobe are 

 exceedingly small. 



The 2nd pair of maxillæ (fiii;. 38) have the 2 outer 

 dactyliform projections exceedingly slender. and furnished 

 at the point with 3 delicate bristles. 



The maxillipeds (fig. 39) are very prominently char- 

 acterized by the unusual development of the masticatory 

 lobe, which is considerably larger than the basal part it- 

 self, and of an oblong, quadrilateral form. with the inner 

 corner drawn out to a sharp, dentiform projection. The 

 palp. on the other hand. is remarkably slender and simple- 

 cylindric. but has, for the rest. the normal number of 

 articulations. The longest of these is the 2nd, which. like 

 the succeeding, is furnished at the point with afew simple 

 bristles. The lamelliform epignath is verv fully developed, 

 of an irregular-triangled fonn. and reaching with its obtuse 

 point about to the extremity of the 3rd articulation of the 

 palp. 



