C8 ANIMAL PARASITES. 



or a solution of liver of sulphur, and I think washing with essen- 

 tial oils, as well as the picking off of the individual red points, as 

 the animals are not yet capable of propagation. 



A similar mite, called " Bete rouge " in Martinique, ac- 

 cording to Kirby, wounds the soldiers standing in the fields in 

 that island, and produces such bad sores that even amputations 

 of the limbs have been obliged to be undertaken ; or, under the 

 popular name of " doctor," pesters the woodcutters and colo- 

 nists on the Mosquito Coast and in Honduras Bay. 1 



FOURTH CLASS OF THE ARTICULATA. 



lNSECTA = The Insects. 



Articulata antennata, organis respiratoriis perclaris, corporis 

 regionibus bene distinctis, abdomine sine appendicibus, pedibus 6, 

 plerumque alata. 



The body consists of separate segments, some of which are some- 

 times entirely or partially amalgamated. However, the head, thorax, 

 and abdomen are generally clearly distinguishable. The thorax 

 and abdomen are coalescent only in a few apterous parasites. 



1. The head bears the antennas and oral organs, as well as 

 the eyes ; the three thoracic segments bear the three pairs of 

 feet on their lower surface, and the wings on their upper; the 

 very distinctly articulated abdomen never bears feet, but at the 

 utmost accessory organs of motion, and always the sexual appa- 

 ratus. The antennae, placed on the front of the head, on the 

 forehead, or on the sides, have very different forms, which, how- 

 ever, may be referred to the form of a bristle, or that of a ringed 

 or jointed club or cone. The external surface of the uniform 

 antennae is, with the exception of the basal joints, beset 

 with small pits and pores, the bottom of which is closed with a 

 delicate, downy skin. The unhomogeneous antennae have 

 a separate stem or shaft, exactly resembling the skin of the 

 body, and the above-mentioned pores and pits, which pro- 

 Jbably have the function of feeling, and perhaps also that of 

 smell, exist only upon the teeth, laminae, &c. The differences of 

 the antennae serve for the definition of the groups and species. 

 The sense of touch is also assisted by the eyes, which are very 

 rarely wanting. The eyes are, partly simple ocelli (or stemmata) 

 which usually stand in aggregations or groups upon peculiar 



11 See Appendix A. 



