354 



University of California Publications. [Entomology 



Type of Genus 

 Stemmatosteres apterus, n. sp. 

 This genus is anomalous in the absence of ocelli, in the struc- 

 ture of the antennal club, the reduction and peculiar configura- 

 tion of the thoracic sclerites and the overlapping of the abdomen 

 upon the posterior part of the thorax. The wings are probably 

 never fully developed on account of the reduction of the mesono- 

 tum. The genus appears to be most closely allied to Acerophagiis 

 Smith. 



Stemmatosteres apterus, n. sp. 

 Fig. 3 



FEMALE 

 Head and body chrome lemon yellow, the dorsal surface of 

 the head with a pearly luster (in life) which reappears to a less 

 degree on other parts of the body; antennae dusky yellowish, 

 purer yellow at the base of the scape ; legs concolorous with body, 

 dusky only at tip of the last joint of the tarsi ; a linear mark on 

 each side of pronotum at the neck, and the exserted portion of 

 the ovipositor sheaths blackish ; the vibrissal plates brown. 



Fig. 3. Stemmatosteres apterus: A, female, dorsal view; B, lateral 

 view of head, female; C, antenna of female; D, antenna of male; E, right 

 mandible of female, ventral view. 



