STATES OF INSECTS. 317 



can bring forward only one striking instance of it, and 

 some degree of doubt rests even upon that. In the genus 

 Nemognatha of Illiger, the maxillae of the male are elon- 

 gated, narrow, setiform, and often involute or spiral, like 

 those of a bee or a butterfly. But that this is peculiar 

 to the males is at present only surmised a . I possess se- 

 veral species of the genus, all of which are distinguished 

 by long maxillae ; though in some they are as long as 

 the body, and in others scarcely half that length. Gna- 

 thmm Kirby is similarly characterized b . 



The maxillary palpi occasionally differ in the sexes. 

 In Cerccoma those of the female are filiform, while the 

 two intermediate joints of those of the other sex are much 

 thicker than the first and the last c . In Hylcecetus and 

 Lymexylon, those of the male are still more remarkable : 

 they are pendent, the last joint very large, and laciniated 

 so as to form a tuft d . The female ones grow gradually 

 larger towards the end, but are not at all divided there e . 

 The palpi of male spiders are of a very different struc- 

 ture from those of the other sex, term mating in a very 

 complex incrassated piece, which has been supposed to 

 contain the organ of generation; but this, according 

 to Treviranus, is a mistaken idea — that organ feeing, as 

 usual, to be found in the abdomen f . In the common 

 gnat the palpi of the male are as long as the proboscis, 

 consist of five joints, and at the end are tufted with hairs; 

 while those of the female are scarcely one-fourth of its 



a JV. Diet. d'Hist. Nat. xxii. 488: 



b Linn, Trans, xii. 425—. I. xxii./. 6. c Plate XXVI. Fig. 2. 

 d Ibid. Fig. 3. e Oliv. no. xxv. Lymexylon, t. \.f. 1. 



f De Geer vii.249— . t.xiv.f. 20, 21. Treviranus Arachnid. 36—. 

 t. ii./. 16. a h c. t. iv./*. 35—37. 



