14 [January, 



while posteriorly they weaken and lengthen so that the Sth pleurite bears 

 3 very long and strong bristles with 3 much shorter and finer ones. Tergites 

 with 1 row of bristles (12-18) of which the last on each side is long. The 

 9th tergite bears 2 long bristles at each side and 2 medianly, and there are half 

 a dozen slenderer bristles along the edg,e of the corresponding sternite and 2 on 

 the under svirface. The other sternites except the 2nd bear at each side a 

 larger or smaller patch of short spines with a row of single bristles (up to a 

 dozen) stretching between. The 2nd sternite bears one row of bristles with a 

 short thick process bearing an aster of 5-6 heavy spines on each side. 



On the under surface of the c? -apparatus, just before the broadening out of 

 the basal plate, are the chitinized parts figured. Their homology is uncertain 

 (figs. 2 h and c). 



$ closely x-esembling the S , but longer, with more pronovinced chaetotaxy 

 and the usual sexual diffei-ences in the terminal segments. Of the abdominal 

 tergites 1-4 are more or less modified on the posterior edge. Tergite 1 is pro- 

 duced from each side backwards coming to a broad rounded point beyond a 

 line connecting the anterior angles of the 3rd pleurites, i.e., extending nearly 

 li segments beyond the normal transverse line. Tergites 2 and 3 trespass 

 about the breadth of the following pleurite. The posterior edge of tergite 4 

 is convex instead of straight. From 5-8 the posterior edge of the tergite is 

 again normal and straight. 



Coloii^r. (J and $ pale brown to chestnut, darker round the antennal sulcus, 

 along the occipital edge, and on the legs. J . In the completely adult condition 

 the abdominal segments are crossed by simple, pale bands which are darker at 

 the sides. $ . On the first 5 abdominal segments the darker lateral marks 

 are more extensive and wedge-shaped, those on 4 and 5 being drawn out. 



MEASUEEMENTS. 



c?. ?. 



Length. Breadth. Length. Breadth. 



Head 3S .55 40 .61 



Prothorax 20 .32 23 .38 



Meso- and Metathorax... .29 .50 .34 .68 



Abdomen 87 .67 (3 and 4)... 1.28 .9 (3 and 4) 



Total 1.74 mm. 2.25 mm. 



Holohjpe : a (J in Brit. Mns. Eeg. No. 1914—535. (Presented 

 by The Imperial Bureau of Entomology). 



Described from 5 ^J (^, 5 ? $ , and 11 immature examples. 



From a " Yellow and black-billed Toucan," from Colombia, Boca 

 de Arguia, Atrato Valley (Br. A. Balfour, v. 1914). 



