58 Trans. Acad. Sci. of St. Louis. 



Ophiomorphus and Adelobium refer solely to the large 

 South African species forming the type of Dolicaon. Dr. 

 Sharp describes from South America (Tr. Ent. Soc. Lond., 

 1876, p. 247) a small and very aberrant species, under the 

 name Dolicaon distans, without however alluding to the 

 structure of the terminal joint of the maxillary palpi, so that 

 I cannot confirm the generic reference. The probabilities are 

 that it is not one of the Dolicaones as here restricted. 



Paederi. 



In this unusually isolated subtribe the labrum loses a 

 good deal of the value that it has elsewhere, and, although 

 always rather short and broadly truncate, with a small median 

 notch or sinus somewhat as in the Lathrobia, this emargin- 

 ation may be rather wide and shallow, evenly rounded and 

 without flanking teeth as in the European /^^c^^^es — judging 

 from a specimen so named for me by Mr. Reitter, — or an 

 abruptly formed semicircle, with a short broad obtuse tooth 

 at each side, as in femoralis, or a true triangle with straight 

 sides, with short lobe-like teeth adjoining, as in riparius, in 

 all the cases mentioned being entirely devoid of a denticle at 

 the bottom of the emargination. Or, the emargination may 

 be deep, evenly rounded and with a small acute tooth at the 

 bottom, with the apical margin adjoining only broadly and 

 arcuately lobed, as in littoreus. Most of these cases refer to 

 Paederus proper. In Paeder'idus Rey, probably throughout 

 the genus, the median emargination has a more or less evident 

 triangular tooth at the bottom, this being homologous with 

 the median tooth in the Lithochares. 



In general structure, especially in the form of the pro- 

 sternum, labrum and strongly dilated anterior tarsi, the 

 Paederi display more affinity with the Lathrobia than any 

 other type of Paederini, and the more or less fortuitous tooth 

 at the bottom of the labral emargination, together with the 

 prosternal structure and the dilated anterior tarsi, prove 

 also a relationship with the Lithochares. It is still more 

 evidently related to Lathrobia through Domene, — a genus 



