Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 28
Sanskrit:
दन्दशूकादय: सर्पा राजन् क्रोधवशात्मजा: ।इलाया भूरुहा: सर्वे यातुधानाश्च सौरसा: ॥ २८ ॥
ITRANS:
dandaśūkādayaḥ sarpārājan krodhavaśātmajāḥilāyā bhūruhāḥ sarveyātudhānāś ca saurasāḥ
Translation:
The sons born of Krodhavaśā were the serpents known as dandaśūka, as well as other serpents and the mosquitoes. All the various creepers and trees were born from the womb of Ilā. The Rākṣasas, bad spirits, were born from the womb of Surasā.