56 ENTOMOLOGICAL SOCIETY 



cells, one recurrent nervure and the stigma long, narrow, lanceo 

 late ; otherwise as in many Braconids. 



It was in 1825 that Mr. L. A. De Brebisson discovered these 

 insects, captured in Germany, and upon which, in the Encyclo 

 pedic Methodique, vfol. x, p. 23, he founded the genus Paxy- 

 lomma, now changed to Pachylomma^ naming the two species 

 Paxylomma buccata and P. Cremieri respectively, and placing 

 the genus among the Ichneumonidcc. 



The next two authors to treat of the genus were Latreille and 

 Haliday, and they removed it to the family Evaniidce. 



In 1834 Nees von Esenbeck, in his well-known Monograph, 

 vol. i, p. 28, redescribed Pachylomma buccata under the name 

 Hybrizon latibricola, placing it in the family Braconidce, be 

 tween the genera Aphidius and Perilitus. 



A year later, 1835, Wesmael, in his work on the Belgian 

 Braconidae (Nouv. Meth., &c., Brux., p. 90), also treats of it as a 

 Braconid genus. 



Westwood, five years later, or 1840, in his '' Introduction," vol. 

 ii, p. 53, treats of it under the family Evaniidce, and in fig. 74, 

 no. 17, gives an enlarged figure of P. buccata. 



While treating of it under the Evaniidce he remarks, however, 

 asfollows : ''The genus Paxylo?nma Brebisson, placed by Latreille 

 and Haliday in this family, as well as Stephanus, appear rather 

 to belong to the Ichneumoncs adsciti, or at least to constitute 

 the links between them and the present family," and in his 

 Generic Synopsis, at the end of the volume, has placed it with 

 the JBraconidce, among th-e Polymorphi, with Euphorus, Macro- 

 centrus, &c. 



Three years later, Brulle in Histoire Naturelle des Insectes 

 Hymenopteres, tome iv (1843), p. 482, treats of the genus under 

 the Braconidcc, but says, " On ne connait qu'une seule espece de 

 ce group, qui semblenait se rapporter beaucotip mieux aux Ich- 

 neumonides de la division des Ophion, qu'a aucun groupe de 

 Braconides," but finishes by remarking : " Nous laissons nean- 

 moins ce groupe dans la familie des Braconides a cause de 

 1'absence de la seconde nervure recurrente." 



In 1848 Ratzeburg in his " Die Ichneumoniden der Forstin- 

 secten Band, ii, p. 53," treats of both species, placing the genus 

 with the Braconidce and giving us, for the first time, some infor 

 mation respecting their habits. Fourteen years later Dr. Arnold 

 Forster, who was probably the greatest systematic worker among 

 the parasitic Hymenoptera, in his u Synopsis der Familien mid 

 Gattungen der Braconen," published in 1862, made Pachylomma 

 the type of his subfamily 13, or the Pachylommatoidas, and sub 

 divides the old s^enus into two, as follows : 



