60 THE EARLY STAGES OF TABANIDiE 



third in a jar of damp earth together with some small angleworms. 

 Twelve hours later the first lot were all dead; both of the other 

 lots were lively and apparently in good condition. The second group 

 continued to live, without food for about ten days and then died. 

 The remaining group lived for some weeks but finally died also, the 

 angle worms being alive and uninjured. 



Walton concludes that the larva is terrestrial (as confirmed by 

 McAtee) and the period of incubation is from seven to ten days 

 (see above). 



The young larva (Plate 7, Fig. 93, a, b, c) is described as follows: 



"The freshly hatched larva is slightly more than 2 mm. in length, slender, but 

 capable of contracting the body into an almost spherical mass; in color it is pale 

 yellowish white, semitranslucent. The head, which is capable of being entirely 

 withdrawn into the first thoracic segment, bears several pairs of antenna-Uke 

 appendages and an obtusely pointed chitinous hook." 



"On each side of the median line of the body, within the second thoracic seg- 

 ment, there is a distinct pinkish spot; also on the last segment there is a pair of 

 round black spots resembling stigmata [Graber's organ (?)]; elsewhere the body 

 seems to be absolutely devoid of hairs or tubercles." 



McAtee's description of the larva goes much more into detail. 

 He also described the adult larva from a specimen collected by Mr. 

 Theodore Pergande, and the pupa collected by him. In fact the 

 greater part of McAtee's article is devoted to the description of the 

 newly hatched and full grown larva and pupa of this species. In the 

 description of the larvae the segments are numbered from the head 

 backwards. McAtee does not accept the customary use of the terms 

 pro-, meso-, and metathorax for the three anterior segments of the 

 larvae, but speaks of them as the first, second, and third body segments, 

 which they really are. In the newly hatched larvs they are scarcely 

 differentiated from the following segments. In the full grown larvae, 

 while distinguishable by the surface markings, their exterior features 

 are homologous with those of more posterior body rings. In com- 

 paring and describing them, therefore, it is more natural to use 

 numerical designations. McAtee's description of the young larva 

 follows : 



''First Stage Larva;. — The average length of first stage larvae of Goniops chry- 

 socoma which have been preserved in alcohol is about 1 mm. In life they are 



