172 Mr. E. Saunders' Synopsis of 



6. Nomada alternata, Kirb. (PI. VI., figs. 6— 6b). 

 Kirb., Mon. Ap. Angl., ii., p. 182 = Marshamella, Kivh. ; 

 Smith, Cat. Brit. Hym., 2nd ed., p. 131. 



Antennae coloured as in the last species, its joints longer than 

 wide ; 2nd joint of flagellum in the ^ half or more than half the 

 length of the 3rd ; in the ? about the same length as the 3rd ; 

 tegulae testaceous-brown ; tubercles generally more or less flavous ; 

 two spots on the scutellum (often wanting in the <?) flavous. 

 Abdomen with interrupted flavoxis bands ; apical spines of the pos- 

 terior tibiae in the 5 pale. 



(? . Only differs fi-om the preceding by the longer 2nd joint of 

 the flagellum and the shorter 3rd, and by the testaceous, not 

 flavous, tegulae, and by usually having a black streak on the tibiae 

 posteriorly (for genitalia, &c., see PL VI., figs. 6 — Gb). 



$ . Differs from the preceding by the longer 2nd joint of the 

 flagellum, the testaceous tegulae, and the pale spines of the posterior 

 tibiae. Length, 10 — 13 mm. 



Very variable, like the preceding species, in the extent 

 of the yellow markings. 



Hah. Generally distributed, and common in April 

 and May. Parasitic on Andrena nigrocenea and atriceps ; 

 and F. Smith says he has observed it in the burrows of 

 Eucera. 



7. Nomada jacohcece, Panz. (PI. VI., figs. 8 — 8h). 



Panz., Faun. Germ., 72, 20 ; Smith, Cat. Brit. Hym., 

 2nd ed., p. 128. 



A shorter and more compact insect than either of the preceding. 

 Antennae with the flagellum almost entirely black in both sexes, its 

 joints as wide, or nearly as wide, as long ; 2nd and 3rd joints in 

 the 3' subequal ; 3rd in the J distinctly shorter than the 2nd ; 

 tegulae, tubercles, and scutellar spots very prominent and flavous. 

 Abdomen with interrupted bands ; posterior tibiffi outwardly vxn- 

 armed. 



3' . Head and thorax black, almost glabrous, largely and 

 densely punctured; mandibles, except the piceous apices, labrum, 

 clypeus, except the extreme base, and face at the sides of the 

 clypeus, flavous ; face below the antennae clothed with silvery 

 hairs. Antennae short, black above throughout their length ; scape 

 flavous beneath ; flageUum piceous beneath, its 2nd and 3rd joints 

 subequal ; prothorax with the collar and tubercles, mesothorax 

 with the tegulae, and a round spot on each of the mesopleurae 



