()4 THOMAS S.W FOUNDATION 



median, deep yellow, occipital spot reaching forward be- 

 tween the ocelli ; dark brown, coarsely sculptured, oval- 

 shaped spots on the lateral occipital areas. Antennae 

 brown, the basal segment the darkest ; under side of head 

 pale, palpi dark brown. 



Pronotum rectangular, not as broad as the head; sides 

 straight, front and hind margins convex, angles blunt ; a 

 yellow median band, broader behind ; the inner regions of 

 the lateral fields with embossed markings. Meso- and 

 metanotum and the entire venter of the thorax, with the 

 exception of narrow areas surrounding the bases of the 

 legs which are paler dark brown. Legs brown except a 

 pale band before the knees and pale tibiae. Wings with 

 yellow-brown venation, except basal portions of costa and 

 sub-costa in fore-wing and all bases in hind wing which 

 are yellow ; an irregular network of cross-veins extending 

 from costa through the anterior branches of the sector, 

 the network richest between veins Rl and R2, more 

 than the first half of the costal area beyond the humeral 

 crossvein free from crossveins; the length of the inner 

 inter-radial cell twice as great as its base. Without gills. 



Female. Abdomen uniformly dark brown, setae long 

 and slender; alternately ringed with dark brown and 

 white, except for the first few basal segments, which 

 have but a single ring of dark and light, each segment is 

 marked with a white basal band followed first by a nar- 

 row brown, then a narrow white ring, and finally a broad 

 brown one. The eighth ventral segment produced some- 

 what triangularly with a rectangular notch in the tip. 

 Subanal plates, large, triangular (fig. 52). 



Distribution. — Described from a single female with- 

 out locality record. 



Perlodes minor Klapalek. 



1912. Arcynopteryx minor Kip., Coll. Zool. Selys, 4:22. 



1917. Arcynopteryx minor Smith, Trail. Amer. Ent. Sue. 43:483. 



This species being unknown to us, as it was to Miss 

 Smith, we copy here her translation of the original de- 

 scription : 



Male. Length of body, 11 mm. ; female, 13 mm. ; length 

 of anterior wing of female, 14 mm. 



Anterior part of the body almost black, abdomen black- 

 ish brown, in the female yellowish spots on the venter. In 

 the male the small crown spot of the head joins the occipi- 

 tal bands and widens laterally along the crown suture ; the 

 sides of the clypeus are yellow-brown. In the male the 



