1920.) \-)\i 



(ith ventral slightlv shorter, its hind niarpin forming a flatter curve ; 7th 

 ventral completely hidden by the defiexed lateral pieces of the 9th dorsal, 

 which extend jnst beyond the mid-ventral line, one overlapping the other (the 

 left side overlaps the right in all the specimens examined), and each of whicli 

 is prodnced into a blunt style at the apex; these two styles project beyond the 

 lOtli dorsal and are visible from above, so that the body appears bifid at 

 the apex. 



Both sexes have a conspicuous patch of golden pubescence on the middle 

 of the 10th dorsal segment. 



In the above numbering of the dorsal and ventral segments 

 Ganglbauer is followed (Kaf. Mitteleur. ii, 1895, pp. G-9). The Sth 

 dorsal is in this case the seventh exposed segment, since, in my material 

 of this species at any rate, the 2nd dorsal is not hidden by the elytra. 



Htmenopterous parasites bred from the puparta. — On or 

 shortly before October 25th a single winged Chalcid emerged. 

 Mr. Waterston tells me that it is a Pteromaline. Only two beetles 

 had emerged in the vessel at that time, and only two puparia showed 

 emergence-holes, one being a puparium of Coelopa, the other of 

 Fiicomyia. 



On November 29th I found that 3 specimens of a wingless Procto- 

 trupid had appeared. They were determined by Mr. Waterston as 

 PInfymisclius dilatatus Westw. (Diapriinae), and are all cT . While 

 at Swanage I collected among the seaweed two other specimens, one of 

 wdiich was very much larger than the rest. It is uncertain whether the 

 3 Plutymischus came out of one or more puparia, but the fact that all 

 were found in the same vessel at the same time suggests that ail emerged 

 from one puparium. By checking the number of puparia showing 

 emergence-holes against the number of Aleochara emerged, it a])peared 

 nearly certain that the Platymischus came out of ])uparia (or a 

 puparium) which also contained an Aleochara ; but whether they had 

 parasitised Coelopa or Fiicomyia is uncertain : both of which conditions, 

 as noted above, also existed in the case of the Pteromaline. [Mr. Lyle 

 l)rcd from his puparia of Oryyma, besides Aleochara, also the Braconid 

 Aphaereta cephalotes, and numbers of a wingless Proctotrupid : perhaps 

 the latter was Platymischus .^ 



DesceiptiOjS's of puparia of the host-flies. ^ — In the following 

 paragraphs the terms '■'^ anterior spiracles'''' and " posterior spiracles'''' 

 I'efer, of course, to those of the last larval stage, the form of which 

 stigmata persists in the puparium. The anterior sjn'racles have the 

 usual form of a series of papillae. In the three species under I'eview 

 each of tlie postei-ior stiffiiuilic j>l(i/e^ l)o:irs 3 curved chitiiious ridges, 



