8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



these is known to oviposit in the l-year-oid acorns ol' red oak and 

 produce an acorn pip gall. On the other hand, several small species 

 from small nonwooly flower galls have a very short ovipositor and may 

 produce twig swellings, but these suggestions need to be confirmed 

 by experimental studies on the life history of individual species. 



This section of the genus CaJUrhi/tis with short pubescent, non- 

 ciliate wings maj' be divided rmiohtly as follows into two habitus 

 groups : 



Venation normal, veins beyond second cross-vein normall.v distinct ; aerolet pres- 

 ent (except in fulva Weld) ; pubescence on surface of wing distinct but short. 

 Robust agamic forms with an average size of at least 3.0 mm. and usually over 



3.5 mm Section A. 



Venation usually very pale, the veins beyond second cross-vein colorless and 

 barely visible ; aerolet absent ; pubescence represented by mere dots or absent. 

 Body unicolored and usually light yellowish brown. Mesoscutum bare, cori- 

 aceous or rugose. Small species averaging (except in fructiiosa Weld) less 

 that 3.0 mm Section B. 



SPJCTION A. 



This group includes species from root galls and from pip galls 

 besides acorns. As the root-gall species have been treated in a pre- 

 vious paper, they are not included in the following key. Those spe- 

 cies bred from pip galls, besides acorns, have a distinct habitus in 

 that they are robust light brown or yellowish species with the ante- 

 rior and parallel lines sometimes infuscated, the mesoscutum imi- 

 formly covered with sparse short appressed pubescence which does 

 not hide the sculpture, which is never coarse. If nonciliate winged 

 species of Callirhytis are known to have been reared from root galls 

 they should be run through the key on page 213 of the root-gall 

 paper.^ They have the mesoscutum so densely long pubescent as to 

 hide the sculpture as in Disholcaspis or else bare or with but few 

 setigerous punctures along the grooves. 



KEY TO SPECIES OF SB>CTION A. 



1. Parapsidal grooves distinctly percurrent 2 



Parapsidal grooves obsolete anteriorly — not distinctly reaching the front 

 margin 5 



2. Mesopleurae mostly bare and shining although aciculate. Large median 



dorsal black spot on second tergite. A pale species. California. 



carmelensis new species, p. 20. 



Mesopleurae mostly aciculate but dull and short pubescent, shining if at all 



only on upper hind margin. Mesoscutum coriaceous 3 



3. Parapsidal grooves smooth and shining, almost uniform in width throughout. 



Q. coccinea. Gall in spring balanosa, new species, p. 19. 



Parapsidal grooves with transverse ridges, distinctly broadened behind___4 



4. Antennae 14-segmented. OceJlocular space at least equal to and usually 



greater than postocellar glandulus (Beutenmueller), p. 23. 



Proc. U. S. Nat. Mus., vol. 59, no. 2368, 1921. 



