1800 Insects. 



discrepancy in the usual structure of the antennae of the perfect 

 insect. 



Schismatocera, in which the antennae have a lamellated 



club : ex. Scarab aeus. 

 Cordylocera, in which the antennae have a comparatively 



solid club : ex. Silpha. 

 Nematocera, in which the antennae arq filiform : ex. Ca- 



rabus. 

 Macrocera, in which the antennae are filiform and remark- 

 ably long : ex. Cerambyx. 

 Brachycera, in which the antennae are sub filiform and short: 



ex. Chrysomela. 

 Prionocera, in which the antennae are pectinated or serrated : 



ex. E later. 

 Hormocera, in which the antennae are moniliform: ex. 

 Blaps. 

 It will, perhaps, save the reader's time and my own, if we dismiss 

 without investigation, such of these groups as present no similarity in 

 their larvae to that of Stylops, these are the Schismatocera and Ma- 

 crocera. Among the other groups there are abundant instances of 

 partial similarity to the foetal larva of Stylops, but in the subdivisions 

 of one of them this similarity becomes very striking. I allude to the 

 Hormocera, a truly diversified group, but composed of genera asso- 

 ciated by important and constant characters ; the most marked of 

 which, is that they are all heteromerous. From these I select a few 

 examples. 



Sitaris humeralis. The fcetal larva of this beetle is extremely mi- 

 nute, active and hexapod : its general figure resembles that of Lepis- 

 ma saccharina, but it is somewhat more flattened ; the head is 

 marked by a distinct indentation or neck, and has two dark spots, 

 which may be supposed eyes, and two distinct antennae which 

 are about the same length as the head ; these are (perhaps) four- 

 jointed and terminate in a seta : there- are twelve other segments, the 

 last of which is furnished with two short appendages. We have no 

 record of any progressive growth or development of this larva ; its 

 history and structure are alike unknown until long after its metamor- 

 phosis ; it then appears as a white, obese, fleshy, apod maggot, in the 

 nest of that well-known bee Anthophora retusa : whether it enters the 

 larva of the bee and feeds on its substance, or devours the food stored 

 by the parent has not been determined : it is, however, quite certain 



