100 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 37. 



have the basal article large and dilated ; the second and third articles 

 are narrow, elongate, about equal in length, and shorter than the 



basal article; the fourth article 

 is one and a half times longer 

 than the third, and is about as 

 long as the basal article. Sec- 

 ond antennae with the first 

 article short, not reaching be- 

 yond the first article of the first 

 pair of antennae; second article 

 reaching to the end of the fla- 

 gellum of the first pair of an- 

 tennae, being 4 mm. long; third 

 article elongate, about three 

 times longer than the second 

 article, being 13 mm. long; 

 fourth article more than one 

 and a fourth times longer than 

 the third, being 23 mm. long; 

 fifth article about equal to the 

 fourth in length, being 24 mm. 

 long ; the flagellum is composed 

 of 10 articles, the first one of 

 which is almost as long as all 

 the others taken together. 



All seven thoracic segments 

 are furnished with two tuber- 

 cles each, close to the posterior 

 margin, one on either side of 

 the median line. The fourth 

 segment is about one and a 

 fourth times longer than the 

 third. The epimera are distinct 

 on all the segments with the ex- 

 ception of the first ; on the sec- 

 ond, third, and fourth segments 

 they are small and anteriorly 

 placed; on the three last seg- 

 ments they are large and con- 

 spicuous and situated about 

 fig. 24.— arctueus hastiger. x ih the middle of the lateral 



(Drawn by Miss V. Dandridge.) margin 



The abdomen is composed of three segments, two short ones and the 

 terminal segment, which ends in a pointed extremity, and has two 



