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NEW YORK STATE MUSEUM 



tri- or quadriarticulate. The male genitalia are stout with a short, 

 swollen terminal clasp segment. The one reared American species, 

 M . 1 i g n i v o r a Felt, was obtained from the fungous affected 

 heartwood of a pine, the larvae undoubtedly using the rather stout 

 breast bone to erode irregular cavities in the affected wood. 



Fig. 50 Fifth and sixth an- 

 tennal segments of female M o - 

 nardia lignivora, en- 

 larged. (Original) 



Fig. 51 Fifth antennal segment, views from op- 

 posite sides, of M on a r d i a lignivora, male, 

 enlarged. (Original) 



Key to species 



a 11 antennal segments, subsessile; females 

 b Length 1.2 mm; abdomen fuscous yellowish; fifth antennal seg- 

 ment with a length equal to its diameter, the third palpal segment 



one-third longer than the second gilletti Felt, C. 1239a 



oa 12 antennal segments, subsessile; females 



b Length 2 mm; abdomen fuscous yellowish; fifth antennal segment 

 with a length one-quarter greater than its diameter, the third 



palpal segment one-quarter longer than the second 



toxicodendron Felt, C. 122 

 bb Length .75 mm; abdomen fuscous yellowish; fifth antennal seg- 

 ment with a length one-quarter greater than its diameter; fourth 



palpal segment with a length one-half greater than the third 



alexanderi n. sp., C. 1370 

 aaa 14 antennal segments 



b Antennal segments subsessile 

 c Length 2 mm; abdomen fuscous yellowish; fifth antennal seg- 

 ment with a length one-half greater than its diameter, the 



fourth palpal segment as long as the third 



pinicorticis Felt, C. 799 

 bb Fifth antennal segment with a stem one-third the length of the 

 basal enlargement ; males ; subcosta uniting with costa at the 

 basal third 

 c Length 1.5 mm; abdomen reddish brown; terminal clasp seg- 

 ment plainly pyrif orm karnerensis Felt, C. 29 



