192 STRONGYLOGASTER DELICATULUS. 



second; in maculus and mixtus they are almost 

 equal. 



7. STRONGYLOGASTER DELICATULUS. 

 PI. XI, fig. 3 ? ; PI. I, fig. 7, larva. 



Tenthredo delicatulus, Fall., Acta, 1808. 



eborina, Klug, Berl. Mag., viii, 196, 141; Htg., 



Blattw., 301, 12. 

 Strongylogaster delicatula, Thorns., Op., 293, 4 ; Hym., i, 244, 



6; Cam., Fauna, 18, 4; Andre, 



Species, i, 412 ; Cat. 51,* 5. 



Selandria phthisica, Voll., Tidj. Ent., (2), iv, 123, pi. 3, fig. 4. 

 Strongylogaster viridis, Smiedeknecht, Ent. Nacht., 1881 ; 



Andre, Species, i, 412 ; Cat., 51,* 6. 



White (greenish when fresh), smooth, shining, glabrous ; head 

 (mouth excepted), a small mark in front of mesonotum, one on each 

 side of it, some marks on metanotum, and a large spot on breast, black. 

 Antennae fuscous above from the second segment; abdomen with 

 fuscous marks along the sides, which are narrow at the base and become 

 united in the middle at the apex, where the colour is also darker. 

 Wings hyaline ; costa and stigma white. 



The intensity of the black markings on the abdomen varies, some 

 having only a very faint fuscous line along the sides. The has 

 usually only a thin fuscous line down the sides of the abdomen and a 

 large mark in the centre of the three last segments. 



Length 2f 3 lines. 



The larva is found in July and August feeding on 

 the male and female ferns. It is entirely green like 

 the colour of the ferns. The body is covered with 

 tubercles from each of which projects a longish, bristle- 

 like hair. On the pale greenish head are two black 

 marks on the posterior edge of the vertex. 



I do not know in what manner it pupates in a state 

 of nature, but in my breeding pots it bored into corks 

 where it passed the winter, without having spun a 

 cocoon. 



Delicatulus is an abundant Scotch and North of 

 England species, but appears to be rare farther south, 

 if it is not absent there entirely. 



On the Continent it is common in Sweden, rare in 

 Germany, Holland and France, which are the only 

 countries from which it has been recorded. 



