BRUES: PARASITIC HYMENOPTERA. 55 



evenly but not strongly curved. Median and submedian cells of equal 

 length. 



Type.— No. 2161, M. C. Z., Florissant, Col. (No. 5546, S. H. 

 Scudder Coll.). 



Pimpla sp. 



There is also a single male Pimpla, No. 2162 M. C. Z., Florissant, 

 Col. (No. 12,887, S. H. Scudder Coll.), but I cannot associate it with 

 certainty with any of the foregoing species. It measures 8 mm. and 

 has a banded abdomen. 



Xylonomus sejugatus, sp. nov. 



Female. Length 15 mm. Black, the anterior legs and the posterior tibiae 

 and tarsi brownish; abdomen more or less piceous. Wings subhyaline, clear, 

 but with a slight trace of infuscation. Ovipositor visible for 10 mm. at which 

 point it is broken at the edge of the stone. Size and stature of X. humeralis 

 Say. Antennae only in part preserved; black, the joints near the base of the 

 flagellum nearly twice as wide as long. Mesonotum and pleurae smooth or 

 nearly so ; metanotum distinctly, but only partially areolated as in X. humera- 

 lis. Abdomen twice as long as the head and thorax together, the first seg- 

 ment as long as the second and third combined, irregularly striated along 

 the sides; third shorter than the second; fourth as long as the third; fifth, 

 sixth, and seventh longer, but not much higher than the fourth, the abdo- 

 men being only gently swollen at the apex. Legs long, especially the hind 

 pair. Hind coxae swollen, more near the base, the hind femora and tibiae 

 rather thick. Wings with a narrow stigma which is pale at the base and fus- 

 cous apically. Nervures piceous. Areolet absent, the radial and cubital 

 veins very closely approximated at this point where they are somewhat thick- 

 ened. Marginal cell very long, the second section of the radius nearly three 

 times as long as the first. 



Described from one specimen and part of its reverse. 



Type.— No. 2211-2212, M. C. Z., Florissant, Col. (No. 11,474 and 

 11,631, reverse, S. H. Scudder Coll.). 



This is an undoubted Xylonomus, and is strikingly similar in appear- 

 ance o the recent X. humeralis Say. It differs, however in the shorter 

 basal segments of the abdomen, which is less strongly clavate. It is 

 a very handsome species. No. 2213, M. C. Z., Florissant, Col. (No. 

 4444, S. H. Scudder Coll.) seems to be the same, but is not well enough 

 preserved to be positively placed. 



