254 THE CANADIAN ENTOMOLOGIST 



A NEW OAK GALL FROM ARIZONA. (HYMEN., CYNIPID^E). 



BY LEWIS H. WELD, EVANSTON, ILL. 



Andricus splendens, n. sp. 



Female.— Head a clear, dark red, finely shagreened, with whitish hairs on 

 lower face and cheeks, slightly broadened behind the eyes, concave behind. 

 Eyes black, bare, coarsely granulate. Antennae 14-segmented, the third and 

 fourth slender and equal, the last slightly longer than the next to last, distal 

 half darker. Palpi 5- and 3- segmented. Mesonotum reddish with a median 

 black area enclosing the two anterior parallel lines and a smooth, black area 

 over base of each wing (but sometimes almost uniformly infuvScated). It is one 

 and a half times as long -as the width of the head, its surface finely coriaceous 

 (best seen in balsam mount) with scattered punctures bearing short whitish 

 hairs. Scutellum is rugose behind with setigerous punctures, has a medio- 

 dorsal smoothish area behind the two distinct black polished shallow pits and 

 a steep triangular impression on each side. Mesopleurae polished, bare except 

 for pubescent area above. Legs lighter in colour, yellowish, with middle and 

 hind coxa? infuscated, hind femur normal, tarsal claws small but in balsam 

 showing a distinct tooth. Wings hyaline with distinct brown veins, surface 

 short brown pubescent and margin short ciliate. Median segment with two 

 distinct outwardly curved ridges enclosing a smooth area which is narrowed 

 at the top. Abdom.en darker, smooth and polished, not compressed, as deep 

 as long and with a pubescent area on each side at base. Ventral spine about 

 three times as long as broad, slightly pubescent. Ovipositor (when dissected 

 out) a little longer than length of antenna, eggs well developed, nearly globular 

 with long pedicel. Using the width of head in widest part in balsam mount 

 as a base the length of wing ratio is 4.61-4.78; length of antenna ratio 2.75- 

 2.93; length of ovipositor 2.71-3.00. 



Range in length of 350 dry specimens measured by optical methods to 

 nearest tenth of amillimeter was 1.3-2.4mm. Other constants for the group were 

 calculated. Mode 1.950 mm. Mean 1.926-0.007. Median 1.933-0.008. 

 Standard deviation 0.181-0.005. Coefficient of variability 9.40%-0.24%. 

 Average deviation from median 0.147 mm. Quartile deviation 0.127 mm. 



Described from two balsam slides, 84 pinned specimens and others in vial 

 dry. 



Type and paratypes in U. S. N. M. Type No. 22328. Paratypes de- 

 posited also in N. Y. State, American, Cornell, Field and Harvard Museums, 

 and with Wm. Beutenmuller and author. 



Related to Andricus rileyi Ashm. (to which it runs in the Dalla Torre and 

 Kieffer key in Das Tierreich) which is a larger species from east of the Rockies 

 without a tooth on tarsal claw. 



Type Locality. — ^Prescott, Ariz. 



Ho.'it. — Quercus grisea Lieb. 



Gall. — Single or scattered on the under side of leaf. Cylindrical with ends 

 and middle slightly swollen, 2 mm. in diameter and 3-5 mm. high, covered with 

 short stout blunt spines from which run faint decurrent ridges. Sessile, often 

 lop- sided, spines more numerous on basal third. The rosy red colour with a 

 straw yellow band around the middle and some yellow at either end, together 



November, 1919 



