CHARLES W. HOOKER. 13 



parently, though both are of normal size or slightly larger, 

 caused no trouble, for the specimen is otherwise normally 

 developed and in good condition. Abnormal veins or stubs 

 of veins (appendices) are not uncommon in either the ante- 

 rior or posterior wing. The type of Ophion abnormis has 

 an abnormal appendix in both anterior wings, extending from 

 the lower part of the discocubital vein — below the angular 

 fraxure — into the third discoidal cell. Another specimen of 

 this species in the American Entomological Society collec- 

 tion has a similar abnormal appendix, but in the right wing 

 only and nearer the angular fraxure. A specimen of Eremo- 

 tylus macrzirus from the same collection has in the right 

 posterior wing an abnormal vein parallel to the upper part 

 of the nervellus — above the fraxure — and connecting the dis- 

 coidal and cubital veins, thereby forming an abnormal cell. 

 In the left posterior wing this vein is present as two short 

 appendices which do not quite connect in the middle. A 

 specimen of Ophiopterus ferrugineus in the United States 

 National Museum, and one of the cotypes of Nototrachys 

 anmdicornis has an abnormal appendix in both anterior wings 

 extending from near the outer end of the radial vein into 

 the second cubital cell. 



Geological History. 

 Comparatively little is known of the geological history of 

 the tribe, but specimens have been taken in the Tertiary and 

 Quarternary. Serres records Ophion " from the lower Oligo- 

 cene of the Tertiary at Aix in the Provence, Frankreich," 

 and Sordelli records " Ophion or Campolex from the Quarter- 

 nary at Pianico, Italy. Scudder states that the family Ich- 

 neumonidae is well represented in Tertiary deposits, though 

 no great number has yet been described. Most of these 

 have been published under the generic names Pimpla and 

 Ichneumon, the former being represented by seven species 

 from Aix, Radoboj, amber, and British Columbia, and the 

 latter by four, from Aix, Oeningen, Radoboj and Utah, be- 

 sides which there are references to others in amber and at 

 Aix." 



TRANS. AM. BNT. SOC. , XXXVIII. 



