Microscopical Essays. 



Perfoliate ; in thefe the head is divided horizontally, but 

 the laminae are connected by a kind of thread palling through 

 their center. « 



Pectinate ; thefe have fevefal lateral appendages, and ap- 

 pear like a feather. 



Aristat^e, fuch as have a lateral hair, which is either naked, 

 or furnilhed with fmaller hairs. 



Befides the foregoing terms, the antennae are called fhort {bre- 

 viores) when they are fhorter than the body; mediocres, or 

 middling, when they are of the fame length ; and longiores 3 

 when they are longer. 



Near the mouth there is alfo a fpecies of fmall filiform ar- 

 ticulated antennas, called the palpi, or feelers; they are gene- 

 rally four in number, fometimes fix ; they are placed under and 

 at the fides of the mouth, which fituation, together with their 

 fize, fufficiently diftinguifh them from the antennae ; they are in 

 continual motion, the animal thrufting them in every matter, as 

 a hog would it's nofe, when in fearch of food. Some have fup- 

 pofed them to be a kind of hand to affift in holding the food 

 when it is near the mouth. 



The forehead occupies the upper part of the head, between 

 the eyes, the mouth, and the thorax. 



The stemmata, or crown, three elevated mining hemi- 

 fpheric fpots refembling eyes, and placed upon the upper part of 

 the head, as in molt of the hymenoptera clafs. 



The 



