210 BULLETIN": MUSEUM OF COMPARATIVE ZOuLOGY. 



Mecistocepil^lus puxctifrons Xew-port. 



Proc. Zool. soc. London, 1842, p. 179; Trans. Linn. soc. London, 1844, 19, 



p. 429; Meinert, Xaturh. tiddskr., 1870, ser. 3, 7, p. 97; Chamberlin, Ent. 



news, 1913, p. 122. 

 Mecistocephalus guildingi Newport, Loc. cit.. p. 429; Meinert, Loc. cit., p. 96; 



Latzel, Mitt. Mus. Hamburg, 1895, 12, p. 101; Pocock, Trans. Linn. 



soc. London, 1893. 24. p. 470; Attems. Zool. jahrb. Syst., 1903, 18, p. 209. 

 Mecistocephalus sulcicoUis Tomos^•ar^•, Termes. fiizetek, 1885, 5, p. 64. 

 Lamnonyx punctifrons Attems, Loc. cit., p. 211. 



Locality. — State of Amazonas: IManaosI QIaiin and Baker). 



This appears to be the first record of the occurrence of a member of 

 the Mecistocephahdae in Brazil. The species is common in the 

 Bermudas and "West Inches. It must logicahy be regarded as the 

 type of Mecistocephalus proper, the other species originally included 

 imder tliis name by Xewport ha^*ing been removed to other genera. 

 It would seem that Xe"n-port did not at the time he erected the genus, 

 know or have in hand any species congeneric vnxh carniolcnsis and that 

 in consequence there appears no justifiable way of continuing the 

 prevalent practice of applying the name rvlecistocephalus to the 

 genus including these species. 



As no difference of distinctive value has been pointed out between 

 yunciifrons and guUdingii and as different authors refer to American 

 specimens at times under one and at other times under the other 

 name, I have united the two as one species as was long ago .suggested 

 by ^Meinert. If the form occurring in the western hemisphere shall be 

 found to differ definibly from that of the eastern hemisphere, it must 

 bear the name guUdingii. 



Tygarrup, gen. nov. 



Body w-idest near middle, attenuated moderately cephalad and 

 more strongly caudad. 



Head large. Cephalic plate longer than wide, narrowed caudad. 

 Frontal stiture present. 



Antennae long, filiform. 



Cl\"peus proper large, triangularly extending forward in middle 

 to between antennae, at middle being three times greatest length of 

 labnmi; clothed with few hairs. 



Labrtmi tripartite, the median piece narrow and caudally one- 



