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The mandibles in all the species examined by me are triden- 

 tate or quadridentate. The genera with largely' stigmated wings 

 have the mandibles 4-dentate in both sexes alike, but excepting 

 the anomalous Eukocbclcia, all the others, where the sexes are 

 known, have 4-dentate mandibles in the female, 3-dentate in the 

 male. 



Tabulating these results, we find: 



A. Mandibles of male and female with four teeth; maxillary 



palpi 6-jointed, labial palpi three-jointed 



N cochclogymis, Prosantcon, Paraiitcoii. 



B. Mandibles of male 3-dentate; of female 4-dentate, maxil- 



lary palpi, 6-jointed, labial three-jointed 



Ncodryiivus, Paradryinits, Chlorodry- 



iiviis (probably Thanmatodryinns, and Chalcogonatopiis. 



C. Mandibles of male 3-dentate; of female four-dentate; max- 



illary palpi less than six-jointed; labial palpi 2-jointed. 



Pscndogona- 



topiis, ParagonalopnSj Haplogonatopiis, GoiiatopiiS' 

 Neogonatopiis, P achy gonato pus and Echfhrodclpha.v 

 So far as the Australian, American and Hawaiian material at 

 my disposal is concerned, this is a quite natural division or classi- 

 fication of the genera, but the characters given by Ashmead for 

 others, which I have not seen, will, if correct, upset this most 

 natural arrangement. Thvis the largely-stigmated genera Anteon 

 and Chelogynus would, one would have expected- have three- 

 jointed labial palpi and 6-jointed maxillary. In Dryinus with its 

 6-jointed maxillary palpi one would look for 3-jointed labial 

 palps, like Ncodryinus; and in fact Dryinus oruicnidis Ashm. 

 has them so, as well as quadridentate mandibles, and therefore 

 does not enter the genus Dryinus at all as characterized in the 

 Monograph of the N. A. Proctotrypidae. 



Unfortunately I have not been able to investigate the males of 

 many genera, but all those examined by me resemble the females 

 i;-> the number of joints of the labial and maxillary palpi, though 

 frequently differing somewhat in the character of these joints. 

 Should it prove that the males in the difficult series of forms 

 resembling Gonatopus always agree with their females in palpal 

 cliaracters, their separation will be greatly facilitated. 



(b). The thoracic scgincnfs. 



If we take one of the more primitive chelate forms such as 

 Ncochelogynus and Paranfeoii' the thorax does not present any 



