206 



NATHAN BANKS. 



A large transverse spot including the bases of antennae, pterostigma of hind 



wings marked interiorly with blaek 12. 



12. Smaller size, scarcely any of the costals forked before pterostigma in fore 



wings, prothoracic stripes distinct niiiiusciiliis. 



Medium size, quite a number of the costals forked before pterostigma in fore 

 wings, prothoracic stripes run together centralis. 



Ulyrineleon distant n. sp.— Black, head black, shining, mouth pale, some 

 pale spots un vertex and a line close to the eyes; antennae shining black, shorter 

 than thorax; palpi short, last joint black: thorax yellow, with two submedian 

 black stripes, and a broader stripe each side, which does not reach the anterior 

 margin, lower sides with a black stripe, rest of thorax dark, with a few pale 

 spots mostly on the sides; abdomen dull black; legs pale, the femora above on 

 apical half black, tip of tibiae and tarsi annulate with black; wings hyaline, 

 veins dark, mostly interrupted with pale, no clouds, hind wings with subcosta, 

 radius and median vein interrupted with pale, pterostigma of both pairs whitish, 

 fore wings rather broad, hind pair much narrower, both acute at tips, eight 

 cross-veins basad of radial sector in fore wings, two cross veins connecting anal' 

 vein to fork of median. Expanse 60 mm. 



Coronado Beach, California, July (Morse). 



Most of the species of Myrmeleon are rather closely related to 

 each other and hard to separate ; I have found no good characters 

 to separate immaculatus and mo bills. 



1. Two oblique dark lines on the fore wings, one at end of median vein, the 



other at end of anal vein iilgeiiio$«u.s. 



No such oblique dark marks 2. 



2. A pale stripe each side on thorax through the base of wings, size medium. 



tectiis. 

 No such stripe on side of thorax 3. 



3. The anal vein and the sector of the median connected by three or four cross- 



veinlets, rather large species iiiiniaciilatiis. 



The anal vein and the sector of median connected by two (rarely three) cross- 

 veins 4. 



4. Cross-veins basad of radial sector mostly dark, rather larger species. 



<ii!«tan«$. 

 Cross-veins basad of radial sector mostly paler, rather smaller species. 



riisticuK. 

 LIMNEPHILIDJ^. 



Liiniiiephiliis ra<lialus Say.— There is much variation in the extent of 

 the dark markings of the wings in this species. I have seen but one specimen 

 which agrees with Say's description, which seems to be an extreme in markings, 

 usually most of fore wing, except the costal area, is mottled with dark brown, the 

 anastomosis is always darker, there is a whitish spot on thyridium before the 

 fork ; the pale in base of fifth apical cell extends no farther out than than on the 

 fourth and third (which readily separates this species from L. pacijiciis), a semi- 

 circular pale spot including apices of fourth and fifth apical and first and second 

 suba])ical cells; apical part of first and second cells mostly pale, a whitish hyaline 

 oblique spot across middle of thyridial and interclavial cells; pterostigma dark. 



