68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



LUDIUS PROPOLA PROPOLA (LeConte) 



Figures 13, c; 17, a-c 



Corymbites propola LeConte, Trans. Amer. Philos. Soc, vol. 10, p. 437, 1853. 

 Corymbites jurcifer LeConte, Trans. Amer. Philos. Soc, vol. 10, p. 438, 1853. 

 Ludius propola propola (LeConte), BROV^rN, Canadian Ent., vol. 68, p. 184, 1936. 



The taxonomy of this species and its nearest relatives has been 

 revised by Brovi^n (i936d). The typical propola is regarded as 

 an eastern species which ranges from Maine and Nova Scotia to 

 the Rocky Mountains, where it is replaced by the subspecies colum- 

 bianus Brown. 



The larva of only the typical form is known. All specimens were 

 found in litter under poplar or spruce or mixed stands of these 

 two trees. Pupation occurs in late July, with the adults developing 

 in early August. One pupa was found inside of a small decayed twig 

 and another within a cell in leafmold. 



The larva resembles the larger hieroglyphicus (Say), from which 

 it differs by having shorter and stouter urogomphi and prongs (fig. 



17,0,0. 



Description of "mature" larva. — Length 16 mm., fully distended; 

 greatest breadth 2.0 mm. on fourth to sixth abdominal segments. 

 Body robust; with large membranes on lateral aspect; all segments 

 broader than long; head and ninth abdominal segment about two- 

 thirds greatest body width. Dorsum bright yellow (between "ochra- 

 ceous buff" and "clay colour," Ridgway, 1912) ; head and urogomphi 

 somewhat darker; venter paler. Dorsum slightly rugose, sparsely 

 punctulate. 



Head subquadrangular with slightly arcuate sides; flattened above 

 and below. 



Frontoclypeal region with posterior part extending backward al- 

 most to foramen magnum, usually bluntly rounded posteriorly. Two 

 or three prominent anterior nasosulcal setae on each side of base of 

 nasale. Nasale unidentate, terminating sharply when uneroded. Sub- 

 nasale consisting of strongly sclerotized transverse ridge; serrate 

 when uneroded, with 6 to 8 subequal, short, sharp, forward-projecting 

 denticles. Paranasal lobes produced beyond nasale, each bearing 3 

 or 4 setae (i or 2 small). 



Epicranial plates sparsely and finely punctulate. Dorsal sulci want- 

 ing or practically so, but in usual region of each are 4 setae, sub- 

 equally spaced, the most anterior seta being very long, others very 

 small. Ventral sulci bearing row of 6 to 9 setae, usually 5 to 8 con- 

 spicuous. Two pairs of lateroepicranial setae (i of each pair usually 



