CEPHUS AEUNDINIS. 119 



7 (8) Length 78 lines. The fourth and sixth abdominal yellow. 



Head cubital, vertex emarginated. Niger. 



8 (7) Length 2^3 lines. The third and fifth segments banded. 



Head transverse, the vertex scarcely emarginated. Pusillus. 



9 (6) Abdomen with a row of triangular yellow spots along the sides, 



none of the segments banded. Tabidus. 



4. CEPHUS AEUNDINIS. 



x. 



Vol. II, PL VII, fig. 3, ? . 



Cephus arundinis, Giraud, Verh. z.-b. Ges. Wien, xiii, 1286 (1863). 

 CepJius quadricinctus, Thorns., Hym. Sc., i, 320, 2. 



Black, head and thorax opaque, finely punctured, pubescent ; antennae 

 longish, slender ; four anterior knees, tibiae and tarsi, yellow ; middle 

 joints of palpi yellow ; a more or less longish line on second, a band on 

 third, fourth, and fifth, usually complete, a more or less incomplete one 

 on sixth, and sometimes a small mark on seventh, yellowish-white. 

 Saw short, not projecting beyond the cerci. Wings hyaline ; costa 

 testaceous, stigma fuscous or black ; first recurrent nervure inter- 

 stitial, ? . 



Black ; mandibles, a brown spot on lower orbits of the eyes on the 

 inner side, and a large bell-shaped mark on clypeus with a little black 

 mark in its centre, the COXSB and trochanters on lower side, the anterior 

 femora on the lower side, the middle pair entirely, except a ring at the 

 base, the posterior on lower side, 'except at base and apex, and the four 

 anterior tarsi, yellow ; a small mark on lateral edge of second abdo- 

 minal segment, a larger one on third, the fourth, fifth, and sixth, all 

 round, the seventh at the side and the anal appendages, yellow. Wings 

 hyaline, costa testaceous, stigma fuscous, <$. 



Length 5^ lines. 



The one spine on the black posterior legs, the greater 

 number of yellow bands on the abdomen, the cubical 

 head, emarginated behind, and the closely punctured 

 head and thorax, easily separate this species from the 

 others in this section. The greater extent of yellow 

 on the face of 3 and the yellow front legs make it easy 

 of identification. 



The larva lives in the stem (the smaller-sized ones) 

 of the common reed (Arundo phragmites), the stem 

 being neither enlarged nor distorted by the larva, 

 which makes its escape by the side at the top of the 

 place where its transformation has taken place (cf. 

 Giraud, 1. c. supra). 



