INSECTS INJURIOUS TO THE LOCO WEEDS. 



37 



The insect is shown in its ditt'erent stages, highly magnified, in 

 figure 1). The size is indicated hy the hairlines at the right of the 

 figure. It will be noticed that the female fly (c) is larger than the 



Pig. 0. — Fickle midge (Sciara inconsiunn) : a, Male fly; h. external senital organs of male ; 

 c, female ; (/, enlarged antennal joints of same ; c, maxillary palpus of same ; f, tip of 

 abdomen of female from side ; ff, pupa, ventral view ; h, larva, dorsal view, a, c, g, h. 

 Much enlarged ; b, d, e, /, more enlarged. (Author's illustration. ) 



male. The latter (a) is recognized by its claspers, shown much en- 

 larged at h. The larva is a delicate, thread-like maggot of milk-white 

 color with a jet-black head. On account of its minute size — about J 



of an inch in length — its presence is very 

 frequently unnoticed in greenhouses, al- 

 though the flies are more con.spicuous, from 

 their habit of flying about on the " glass." 

 In some cases this species is confused with 

 nematodes or eel-worms." 



THE FOUR-LINED LOCO WEEVIL. 



(Cleonus quadrilincaius Clievr. i 



This curculionid weevil was found breed- 

 ing in considerable numbers on Ar'ngaUuH 

 lamherti at Hugo, Colo., during 1907, by 

 Dr. C. I). Marsh, who reports very appre- 

 ciable injury. As a rule, however, this 

 Km. 10.— Four-lined loco weevil spccics docs not occur in uumbcrs until 



((Iconus quadrilincatus): Adult. j!j. j.i i i i i i ii 



Much enlarged (original). '^"cr the plants have made good growth 



and have seeded. 

 This beetle, (fig. 10) measures about half an inch in length; has a 

 stout rostrum or beak, a little shorter than the thorax; is black, and 

 densely coated with gray pubescence alternating with two pairs of 

 longitudinal black lines, one subsutural and the other submarginal. 



"A more complete accoimt of this insect appeared in Bnl, 27, u. s., Div. Ent., 

 r. S. Dept, Agric, pp. 10.S-I13, 1901. 



