ABT. 1». GALLFLIES OF THE FAMILY GYNIPIDAE WELD. U 



Autc-iiuue 13-segmented. Postoeellar space at least equal to or greater than 

 ocelloeular operator (Osten Sackeu) (agamic), p. 23. 



5. ilesoscutum entirely coriaceous — not more coarsely sculptured behind be- 



tween parapsides than in front. Pits of scutellum sharply bounded behind— 



not opening out on to disk. Median groove at least longer than broad— 6 



Mesoscutum more or less rugose, at least behind between parapsides _7 



6. Areolet indistinct. Wing ratio 3.6. Pubescent patches on sides of second 



tergite large, in side view occupying half the area. Q. phellos. Gall in 



spring middletoni, new series, p. 25. 



Areolet well-delined. Wing ratio 4.2. Pubescent patches on second tergite 

 not occupying half the area in side view. Q. marlUindim. Gall in fall. 



balanopsis, new .specie^;, p. 20. 



7. Mc.so,scutum finely rugose all over. Parapsidal grooves indistinct in the 



sculpture. No median. Q. marilandica. Gall in fall. 



balanaspis, new species, p. 22. 



Mesoscutum slightly rugose behind between parapsides, the scutellum there 



being coarser than in front 8 



8. "Areolet absent." Bred from a spring gall on second year acorns of Q. 



ilioifolia perditor (Ba.ssett), p. 28. 



Areolet present 9 



9. Antenna 1 segment 3 longer than 1 plus 2. Median line reaching forward 



halfway. Distinctly rugose between parapsidal grooves and lateral lines. 

 Scutellum with prominent hump on disk back of pits. Q. velutina. Gall 



in fall balanoides, new .'ipecies, p. 27. 



Autennal segment 3 shorter than 1 plus 2. Median not reaching halfway. 

 Coriaceous between parapsidal grooves and lateral lines. Disk of 

 scutellum without hump anteriorly. Ovipositing April S-11, Q. ilicifoliu. 



patiens (Bassett^ p. 28. 



SECTION B. 



This group includes all the known forms (agamic) bred from 

 '' stone " galls in acorns, all but two of the species described from oak 

 flower galls, one from a hard leaf parenchyma gall, one from a bud 

 gall, some from midrib SAvellings and several from slight twig swell- 

 ings. It has not been possible to assemble all these species in one place 

 for study, and the following ke^^ is at best but provisional. 



KEY TO SPECIES OH" SBCTION B. 



1. Mesoscutum mostly or entirely coriaceous, sometimes slightly rugose pos- 



teriorly 2 



Mesoscutum mostly and distinctly rugose, if coriaceous only anteriorly__20 



2. Mesoscutum entirely coriaceous 3 



Mesoscutum slightly rugose behind between parapsides and sides of pro- 



notum more or less rugose 16 



3. Pronotum rugose on sides. Venation complete including areolot. Antennae 



of female 15, of male 16 segmented. Flower gall. California. 



congregata (Ashmead). 



Pronotum coriaceous like mesoscutum. Venation obliterated in distal half 



of wing, rarely showing areolet. Antennae of female 12, 13, and 14 



segmented 4 



4. Abdomen with conspicuous interrupted ring of dense woolly pubescence at 



base. From twig swellings and bud gall 5 



