NO. lO MORPHOLOGY OF GNATIIOTRICIIUS SCHEDL 5 



Unfortunately he has, Hke other investigators, overlooked the long 

 slender hairs of the lacinia. Therefore he misplaced the genus, 

 which would, according to his interpretation of the characters 

 used, fall in the subfamily Mixtodcutatae. 



1915. Hopkins, A. 0.(48). 



The author placed Guathotrichus in his subfamily Corthylinae. No 

 details. 



I918. SWAINE, J. M.(49). 



The author placed the genus Guathotrichus in his subfamily Iplnae 

 in one group with Conophthorus Hopk., Psciidopityophthorus Sw. 

 and Pityophthorus Eichh. The latter is separated from the rest 

 of the Ipinae by the following characters : 



Eyes not divided, antennal funicle 5-segmented, fore tibia more 

 strongly widened, body nearly glabrous, pronotum with numer- 

 ous asperities in front, the pronotum margined on the caudal 

 border, and the metaepisternum largely covered by the elytra. 



Gnathotrichus was distinguished from the other genera of this 

 group by : 



The mouthparts as seen from below rather sparsely clothed with 

 slender hairs, the maxillary lobe pilose, body slender, very smooth, 

 punctures and pubescens nearly obsolete except on the declivity; 

 the pronotum closely but freely asperate in front, with an acute, 

 arcuate, transverse, short carina at the summit, which is before 

 the middle. 



No generic description given. 



1922. Blackman, M. W.(5o). 



Characters used by earlier authors were applied in placing the genus. 

 The arrangement is similar to that of Swaine (49) ; but the 

 author did not use Swaine's character " mouthparts densely cov- 

 ered with hairs." 



1928. Blackman, M. W.(59). 



The author uses the same cliaracters as Swaine in separating the 

 genus Guathotrichus Eichh. from the rest of the Pityophthorinae. 

 He regards the genera Conophthorus Hopkins, Myelobonis 

 Blackman, Pityophthorus Eichhoff, Pityoborus Blackman, Pity- 

 ophilus Blackman, Psciidopityophthorus Swaine and Gnatho- 

 tricus Eichhoff as a compact division of the Ipinae. 



