208 W. D. FUNKHOUSER 



and this is not the case with the material at hand. It is also apparent 

 that if new species are established the descriptions should not appear in 

 a report of this type; the undetermined material is therefore not discussed 

 further in this paper. It is safe to assume, however, that the sixty-one 

 species here recognized do not represent all the forms of the basin and 

 that future collecting will result in additions to the list. 



Because of the fact that the literature relating to the family IVIem- 

 bracidae is widely scattered and in many cases not readily accessible, 

 it has been deemed advisable to include for each of the local species a 

 short bil)liography containing references of the greatest importance and 

 including the reference to the original description. It happens, however, 

 that many of the original descriptions are very meager and the species 

 have never been redescribed. For this reason it is often difficult for the 

 student to recognize the species unless carefully determined material is 

 available for comparison. For each species, therefore, there is given a 

 short technical description, which, it is believed, will enable the student 

 to recognize at once the species under discussion without referring to other 

 papers or to collections. These descriptions have been written in each 

 case from type or paratype specimens, from specimens compared with 

 types, or from material determined for the Cornell collection or for the 

 author's collection by recognized authorities. With such data at hand 

 it should be possible to recognize even the rarer forms, should such forms 

 be again encountered in the basin. All terms used in the technical descrip- 

 tions are fully explained in the section of this paper dealing with the external 

 anatomy. 



It should be noted that the measurements given in the technical descrip- 

 tions of all the species are maximum lengths and widths unless otherwise 

 noted. The length is considered as the greatest distance from the front 

 of the head to the tips of the tegmina; the width as the greatestTwidth of 

 body, which is usually found at the humeral angles or from tip to tip of 

 the suprahumeral horns when such structures are present. The struc- 

 tures are generally described as seen from a lateral view, since such an 

 aspect of the insect usually shows most of the characters needed for 

 systematic diagnosis. The term tegmina has been used thruout to refer 

 to the front wings, since this word seems to have been generally adopted 

 in the best terminology of the group and is a convenient term to prevent 

 confusion in wing discussion. 



