CLEAR-WING MOTHS OF FAMILY AEGERIIDAE 77 



Synanthedon prosopis McDunnough, Check list of the Lepidoptera of Canada and 



the United States of America, pt. 2, No. 8737, 1939. 

 Synanthedon candescens McDunnough, Check list of the Lepidoptera of Canada 



and the United States of America, pt. 2, No. 8739, 1939. 



Male. — Labial palpi with second joint pure white ; terminal joint black. 

 Antennae stout with short pectination, black. Head, collar, and thorax 

 black. Abdomen all black, or commonly with a narrow, white, trans- 

 verse band on second joint; sometimes with white transverse bands also 

 on other segments, especially the last ; underside all black ; anal tuft black, 

 fan-shaped, slightly edged with white. Forewing transparent with costa» 

 edge, veins and discal mark black. Hindwing transparent, costal edge and 

 veins black, cilia black with tips narrowly white. Legs black with white 

 annulations. 



Female. — With broader black borders on both wings ; otherwise like the 

 male. 



Reared from small woody galls of the encyrtid genus Tanaostigmodes 

 Ashmead on mesquite, kindly determined by A. B. Gahan, of the United 

 States Bureau of Entomology and Plant Quarantine. 



Expanse: 13 to 16 mm. 



Distribution. — Arizona and Brewster County, Tex. 



Food plant. — Mesquite (Prosopis glandulosa) . 



Type. — In United States National Museum. 



SYLVORA, new genus 



Genotype, TrochiUum acerni Clemens. 



Tongue long, spiraled. Antennae of male long, slender, slightly dilated 

 toward tips, with short fine pectinations ; female antennae simple. Labial 

 palpus with second joint erect, thickened with a nearly smooth, short 

 brush, but slightly rufBed in front; third joint short, blunt. Forewing 

 with 12 veins, 7 and 8 stalked to costa, 10 and 11 stalked; hindwing with 

 veins 3 and 4 stalked. Posterior tibiae with rough scaling above; first 

 tarsal joint not thickened with scales. Anal tuft of male fan-shaped, sub- 

 ject to spreading or folding. Male genitalia with aedeagus deeply forked at 

 tip ; penis finely granulated ; sacculus ridge unsealed. Female genitalia 

 with ductus sclerotized only at extreme end ; ostium cup-shaped. 



The genus is based mainly on the stalked veins 10 and 11 in the fore- 

 wing, a small but unusual character in this group where the tendency is 

 for these veins to become confluent at the edge of the wing rather than 

 at the cell. This genus comprises the maple bark borers. The North 

 American representatives are acerni and its races huscki and tepperi. 



