Key to Species 

 Full-grown lax-va 



1 (4). Case made of sand grains. 



2 (3). Coloration more or less light; head and thoracic sclerites yellow 



or light brown; punctation distinct .... 3. M. sequax McL. (p. 371) 



3 (2). Body dark; punctation not distinct everywhere 



1. M. nycterobia McL. (p. 368) 



4 (1). Case made of detritus; larva relatively light, with distinct 



punctation 2. M. lateralis Steph. (p. 370) 



1. Micropterna nycterobia McLachlan 



Pictet, 1834:134-135, Plate VI, Figure 2.- Hagen, 1864:255-256.- 

 Klapalek, 1893:2 7-31, Figure 8.- Struck, 1903:98. - Ulmer, 1903 :67; 

 1909:268, Figure 403.- Lestage, 1921:779-785, Figures 277, 278b, c, d, e, g, 

 h, i, j, k. 



Full-grown larva. Length 16— 19 mm. Head brown or dark brown; 

 posterior angle of frontoclypeus lighter. Eyes on a narrow, light area; 

 ventral surface light brown at anterior margin. Gula dark brown, tapering 

 posteriorly. Dots large, dark brown; wedge-shaped pattern of frontoclypeus 

 distinct; groups of dots lateral to frontal sutures, coronal suture, and on 

 sides; similar dots ventrally near occipital foramien. 



Number and arrangement of gills of M. nycterobia 



Segment 



Dorsal 



Pleural 



Ventral 



2 





1 



1 





3 





1 



1 





4 





1 



1 





5 





1 



1 





6 







1 (0) 





7 



1 (0) 









Labrum wide; setae 5 and 6 blackish brown. Mandibles black; teeth 

 situated distally, small, 4 on each mandible; brush with golden yellow 

 chaetoids; lateral setae dark, situated basally (Figure 515). 



Pronotum yellowish brown; dots large, brown; X- shaped, median, punctate 

 pattern distinct; setae black, with round brown dots at base. Mesonotumi 

 with shining black posterior margin and part of lateral margin; setae black 

 Tergites of metathorax slightly sclerotized. 



368 



