196 



PSrCHE. 



[April 1SS9. 



fine pile consisting of acutely lanceolate 

 hairs arising from a broad, non-nucle- 

 ated base ; those on the sides, especially 

 in front, being directed towards the mid- 

 dle of the epipharynx, and much co;irser 

 than those situated farther l^ack. 



There is no median furrow, and no 

 sense-pits, cups or rods, the median 

 I'eorion beinof clothed with fine hairs. 



Machilh variabilis Say. — The shape 

 of the labrum and epipharynx is \ery 

 singular. The labrum is narrower than 

 long, the front edge slightly excavated, 

 and provided with a row of short, stiff", 

 broad, flat setae, which end in a short 

 fork. There are no traces of a median 

 suture. 



The epipharvnx has no separate me- 

 dian frontal lobe like that of Lepisiua^ 

 but the broad edge simply forms the 

 under surface of the labrum. The edge 

 is provided with a singular armature of 

 about four rows of short thick appressed 

 spines, whose ends turn down a little, 

 so that the}' ajDpear like four rows of 

 somewhat polygonal paving stones ; each 

 has a central nucleus. I can perceive 

 no setae arising from them. Whether 

 these singular shortened and curved rods 

 are gustatory, or in any wa}' sensory, or 

 whether simply defensive, remains to be 

 proved ; T could not detect any ner\ es 

 leading to them. From each side of 

 the end of the epipharynx two series, in 

 oblique rows, of somewhat appressed, 

 rather large, short conical setae, with a 

 nucleus at the end, curve inwards along 

 the distal third of the epipharynx, and 

 thence extend parallel to each other to- 

 wards the base of the epipharynx. Of 



these conical setae, those in front when 

 examined with a power of 400 diameters 

 do not appear to liear a bristle, though 

 there is a nucleus at the end ; but many 

 of those situated farther back bear a long- 

 acute bristle. There is no median fur- 

 row, but the median region is very 

 finely pilose, the fine hairs becoming 

 more numerous at the base and extend- 

 ing along the epipharjngeal lining of 

 the clypeus. No genuine sense-pits, 

 cups or rods could be detected. 



Order Dermaptera. 



Forjicula sp. from Cordova, Mexico. 

 — The labrum is rounded in front with 

 no traces of a median suture. 



Epipharynx with a membranous edge 

 in front, fringed with a dense row of 

 short fine setae, antl just within the edge 

 are two or three rows of sinuous, slen- 

 der, blunt setae, of peculiar shape, which 

 may be possibly gustatory. The svu'- 

 face is covered with very fine scale-like 

 setae, and on each side near the base is a 

 region covered by a short dense pile. 



The taste-pits are few in number, 

 there being only about a dozen on each 

 side in all ; most of them being situated 

 on the anterior half, and a few near the 

 base. The taste-pits are provided each 

 with a short fine seta, as usual, arising 

 from the centre. 



Forjicula larva from Florida, — 

 The front edge of the labrum is entire, 

 rounded, and there are no traces of a 

 median suture. The front edge of the 

 epipharynx forms a slight projection or 

 lobe, about half as wide as the labrum, 

 which is fringed with fine setae, some 



