360 MB. &. D. HA.YILAND ON TEEMITES. 



which are evidently diiferent from and yet allied to this group, 

 tLongb I have not yet obtained an imago. 



These groups, tlie fungus-growers, Goptotermes and Bhino- 

 termes, have soldiers with pronotum more or less flat, and antennae 

 of usually more than 14 segments, and abdominal papillae 

 usually easily visible. They have imagos in which the wings 

 show the median nerve midway between the submedian and 

 subcostal. The remaining groups, containing much the larger 

 number of the species, have imagos in which the wings show the 

 median nerve much nearer the submedian than the subcostal, 

 and soldiers whose antennae have seldom more than 14 segments. 

 It is to these that Dr. Hagen gave the subgeneric name 

 Eutermes ; they comprise numerous groups, with difliculty re- 

 cognized by the imagos, but readily recognized by the soldiers. 

 The name Eutermes had been previously applied by Heer to 

 some fossil forms of the genus Termes, known only from the imago, 

 and in one case only from the wings. The name was limited 

 by Dr. Fritz Miiller to a much smaller group, that in which the 

 soldiers have rudimentary mandibles and a long conical rostrum. 

 He raised this group to generic rank : it is a natural group, 

 worthy of generic rank, if indeed it be not worthy of forming 

 several genera, but it was not in this sense that Heer or Hagen 

 used the name Eutermes. There are a few species in which the 

 wing shows the median nerve nearer to the submedian than the 

 subcostal, and in which the soldier has a flat pronotum. T. planus 

 has a small flat pronotum with an anterior median process, 

 a character found in every caste. T. tenuis has a large, flat, 

 anteriorly bilobed pronotum in the soldier. But in most of 

 the groups in which the median nerve is markedly nearer the 

 submedian than the subcostal, the pronotum of the soldier is 

 saddle-shaped with much depressed lateral angles and elevated 

 anterior lobe, and the antennae have from 12 to 14 segments. 

 These groups contain the greater number of the species, and 

 fall into three sets. In the first the mandibles of the soldiers 

 have a cutting-margin and the labrum is chitinized ; in the 

 second the mandibles, though of considerable length, have no 

 cutting-edge, and the labrum is small and white, with two minute 

 acute diverging lobes ; in the third the mandibles are rudimen- 

 tary, and there is a long perforated conical rostrum in front of 

 the head. 



The species of the genus Termes seem in some cases to be very 



