BY R. J. TILL YARD. 



739 



tacitly the suggestion that they had such an unspeciaUsed system 

 of wing-venation, without any confirmation fi'om the pupal tra- 

 cheation. The suspicion that all was not right led me to study 

 the venation in several well-known genera more carefully. But 

 I obtained no light on this subject for a long time, until one day 

 I noted the persiste^U obliquity of a certain cross- vein just above? 

 and distad from the cubital fork in the forewing of the genus 

 Acanthadisis. Recalling the importance of a similar occurrence 

 in the wings of Odonata, I at once sought for this oblique cross- 

 vein in other genera, and was rewarded by finding it clearly 

 present in the forewings of almost every specimen of Myrinele- 

 onidoi in my collection. I could not, however, detect any sign 

 of it in the hind wing in any case. As the venatious of the two 

 wings appear otherwise to be exceedingly similar, I determined 

 to study the pupal tracheation, and it was with this end in view 

 that the pupa3 of Mynneleon uniseriatus were obtained. 



Text 



fig. 4. — Wing-tracheation from the right forewing-sheath of a pupa 

 of M. uniseriatus { x 19), to show correct naming of tracheae. Com- 

 pare Plate Iviii., fig. 1. (Original). 



As soon as the photomicrographs of the pupal wing-sheath were 

 studied, the reason for the persistent obliquity of the cross-vein 

 above-mentioned was made clear. Text-fig. 4 shows the pupal 

 tracheation of the forewing, while Text-fig. 5 shows the most im- 

 portant portion of it enlarged. In Text-fig. 6, I have reproduced 

 the imaginal venation of the forewing for comj)arison, together 



with the alterations in notation that will now be necessary, 

 results may be stated as follows. 



The 



