32 Psyche [April 



gratified last January, when I found it correctly identified in Pro- 

 fessor Hine's collection from Guatemala and British Guiana. 

 The specimens agree with Van der Wulp's description throughout, 

 except for one thing: — there is not the slightest trace of the row of 

 hypopleural bristles. The genus has so many strong characters 

 that misidentification seems impossible; the only other explana- 

 tion of the discrepancy is that Van der Wulp saw the bristles on 

 some other fly and got it confused with this species, and this 

 I think is what happened. 



Since Charadrella has a number of unusual features, and does 

 not fit well in any of the subfamilies recognized by Malloch in 

 his recent tabulation (Canad. Ent., Dec, 1917, 406), I add the 

 following mostly chaetotactic characters taken from one of Pro- 

 fessor Hine's males : 



Head: front one-fourth the head-width at vertex, widening 

 forward very gradually; frontals in a single row, about 10, the low- 

 est just at the antennal insertion; ocellars broadly diverging, 

 slightly proclinate; no cruciate bristles; verticals as usual but not 

 strong; vibrissse large, just at the lower edge of head, above them 

 a patch of small black hairs extending more than halfway to root of 

 antennae and nearly halfway to the eye; infra-orbital cilia (setae) 

 pale. 



Thorax: ps dc 3 (from the spacing 4 will probably also occur), 

 ant dc 2, hum 4, posthum 1, prs 1, npl 2, intal 2, supal 3 (of which 

 the prealar is less than half as long as the next), postal 2, ant acr 

 0, post acr 1 (prsc), stpl 3 (the anterior small, posterior 2 close 

 together vertically), mesopleura with 3 at lower front corner and 

 a row of 6 behind, sternopleura and mesopleura with upright 

 rather long pale hairs which also cover the pteropleura, hypopleura 

 bare; scutellum with two long pairs, marginal and apical, and sev- 

 eral small submarginal, the disk very hairy; both spiracles very 

 large; hind calypter much exceeding front one; scutellum bare 

 below. 



Abdomen: first and second segments without bristles above, 

 third with 4 marginals, fourth with 6 marginals and a discal pair 

 so far apart that they stand almost at the edge; sternites 2-5 with 

 a few bristles; 2-4 separated from the tergites by a wide mem- 

 brane; genitalia small. 



Wing: third and fourth veins strongly divergent toward tip, 



