Kinsey: Studies of Cyniyidx 



129 



black; antennae almost wholly bright yellow rufous; parapsidal grooves 

 distinct for only a little more than half the length of the mesonotum, 

 longer than in stellatse, shorter than in elongatus; a short median groove 

 often apparent; mesopleurje wholly puncto-rugose, more hairy than in 

 elongatus, wholly brownish rufous; foveas large, broad, largely smooth at 

 bottom; abdomen averaging darker than in elongatus, especially pos- 

 teriorly, the second segment covering a full half of the area; legs brown- 

 ish rufous, coxae wholly rufous, the tibiae and the hind legs in general 

 tending toward a dark brown; wing veins averaging slightly heavier 

 especially the first abscissa of the radius; areolet of moderate size only; 

 averaging larger in build than either other variety, particularly in the 

 width of the thorax and the size of the abdomen. 



GALL. — Short, globoid stem swelling, diameter up to 8. mm., length 

 not over 12. mm, ; rather distinct from galls of the other two varieties, 

 monothalamous or polythalamous, with only four cells at the most. On 

 Quercus breviloba. 



RANGE.— Texas: Austin. 



TYPES. — 18 females, 7 galls. Holotype female, paratype females, 

 and galls at The American Museum of Natural History; paratype fe- 

 males and galls at the U.S. National Museum, and with the author. La- 

 belled Austin, Texas; March 30, 1920; Q. breviloba; Patterson collection 

 number 167. 



Patterson bred insects on March 30, 1920. 



The gall of this variety is very distinct from those of the 

 other two varieties, especially in its much reduced number 

 of larval cells. These cells, however, are quite like those of 

 the other galls of the species. 



Plagiotrichus frequens (Gillette) 



FEMALE. — Shows the following characters in addition to those com- 

 mon to all species of the genus : Color largely dark rufous and black, in 

 large part black; antennae with 14 segments, apical half of antenna 

 darker; mesonotum closely, finely puncto-rugose, entirely but quite 

 sparsely hairy; parapsidal grooves distinct to the pronotum; median 

 groove absent; mesopleurae largely smooth and naked, irregularly, scat- 

 teringly, finely rugoso-aciculate ; foveae distinct; abdomen smooth, not 

 at all reticulated, finely punctate only on the edge of the last segment; 

 almost naked of hairs except for a scatteringly few latero-basally ; longer 

 than high, the second segment not covering more than half the area; 

 infuscation on the first abscissa of the radius limited but rather heavy; 

 ' areolet of moderate size; length 1.7-3.0 mm. 



GALL. — Similar to the galls of the other agamic forms of this 

 genus. A stem swelling, up to 25. mm. in diameter and 110. mm. in 

 length, usually smaller; internally rather woody, mostly solid, soft, 

 spongy; the larval cells closely embedded, sometimes somewhat separable. 

 On Quercus Gambelii, its varieties, or closely related oaks. 



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