May-r-July 1SS9.] 



PSYCHE. 



221 



but no true taste-cups were observed. 



Corymbites hieroglyphicus (Sa}). — 

 Labrum full, slightly notched in front 

 with apparently faint traces of a median 

 suture. Epipharynx pilose, the hairs 

 longest on each side. A few^ small, 

 scattered taste-cups under the base of 

 the labrum and others scattered along 

 the middle towards the front edge. On 

 each side of the anterior clypeal region 

 is a group of 5 taste-cups. 



Campylus denticornis Kirb}-. — 0^■er 

 the pilose surface of the epipharynx are 

 scattered what may be sensory pits, but 

 they are not situated in a bare ai^ea, but 

 among the tine hairs, and these organs 

 may be simply tactile. 



Staphylinus violaceiis. — In a speci- 

 men from Florida, the structure of the 

 labrum is most singular. It is cleft to 

 its base, being divided into two long 

 lobes, with large long setae, and the 

 deep sinus is tilled with very long, 

 densely arranged setae. Epipharynx 

 pilose ; under the clypeus, on each side 

 near the middle, is a bare rounded area 

 in wdiich are situated 4-5 papilliform 

 taste-cups, and at the base behind them 

 is another linear group of about 7 slen- 

 derer, somewhat curved taste-cups. 



Dytiscus sp. — In a 9 Floridan spec- 

 imen there are on the epipharynx under 

 the clypeus, about 25 taste-cups, which 

 are papilliform, being higher than usual ; 

 and on each side under the base of the 

 labrum is a sensory field containing a 

 number of taste-cups. 



Harpalus f annus ^?iy . — Epipharynx 

 with a median triangular depression be- 

 ginning at the base and wideninsr 



towards and ending on the front q.(\^q. ; 

 this trough is lined with a row of spines, 

 which are shortest towards a point lying 

 under the base of the labrum. Over 

 the bottom of the triangular depression 

 (as it appears under the microscope, but 

 in reality the roof of the area) are scat- 

 tered shorter spines, and since gangli- 

 onated nerves can be traced to each of 

 the spines along the front edge, they ax"e 

 evidently at least tactile setae, and not 

 simply adapted for defence. At the 

 bottom of the furrow are four brushes of 

 bristles, and the posterior surface is cov- 

 ered with very fine, short, "gathering 

 hairs." The taste-cups are situated on a 

 narrow linear field, one on each side, 

 lying half-way between the middle and 

 outer edge of the epipharynx, beginning 

 under the middle of the clypeus and ex- 

 tending only to a point situated under 

 the base of the labrum. The taste-cups 

 themselves are in irregular rows, 50 in 

 all, and in addition there is an aggrega- 

 tion of 9 or 10 cups at the anterior and 

 inner end of the gustatory field. Like 

 the others, these aggregated cups bear 

 each a central, short, conical peg, A 

 bundle of thick nerves can be seen end- 

 ing each at the base of the cup. 



CJilaeniiis tomentostis (Say). — The 

 epipharynx bears at a point situated 

 under the base of the labrum midway 

 between the median line and the outer 

 edge, a field on w^hich are situated 25 

 taste-cups. This area extends towards 

 the middle of the labral region. In front 

 of this region, owing to the capacity of 

 the labrum itself, no taste-cups could be 

 detected. 



